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JDBC driver for ClickHouse
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package ru.yandex.clickhouse;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.RowIdLifetime;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import com.clickhouse.client.ClickHouseVersion;
import com.clickhouse.client.logging.Logger;
import com.clickhouse.client.logging.LoggerFactory;

import ru.yandex.clickhouse.response.ClickHouseColumnInfo;
import ru.yandex.clickhouse.response.ClickHouseResultBuilder;


public class ClickHouseDatabaseMetadata implements DatabaseMetaData {

    static final String DEFAULT_CAT = "default";

    private static final Logger log = LoggerFactory.getLogger(ClickHouseDatabaseMetadata.class);

    private final String url;
    private final ClickHouseConnection connection;

    public ClickHouseDatabaseMetadata(String url, ClickHouseConnection connection) {
        this.url = url;
        this.connection = connection;
    }

    @Override
    public boolean allProceduresAreCallable() throws SQLException {
        return true;
    }

    @Override
    public boolean allTablesAreSelectable() throws SQLException {
        return true;
    }

    @Override
    public String getURL() throws SQLException {
        return url;
    }

    @Override
    public String getUserName() throws SQLException {
        return null;
    }

    @Override
    public boolean isReadOnly() throws SQLException {
        return true;
    }

    @Override
    public boolean nullsAreSortedHigh() throws SQLException {
        return true;
    }

    @Override
    public boolean nullsAreSortedLow() throws SQLException {
        return false;
    }

    @Override
    public boolean nullsAreSortedAtStart() throws SQLException {
        return true;
    }

    @Override
    public boolean nullsAreSortedAtEnd() throws SQLException {
        return false;
    }

    @Override
    public String getDatabaseProductName() throws SQLException {
        return "ClickHouse";
    }

    @Override
    public String getDatabaseProductVersion() throws SQLException {
        return connection.getServerVersion();
    }

    @Override
    public String getDriverName() throws SQLException {
        return "ru.yandex.clickhouse-jdbc";
    }

    @Override
    public String getDriverVersion() throws SQLException {
        String driverVersion = getClass().getPackage().getImplementationVersion();
        return driverVersion != null ? driverVersion : "0.1";
    }

    @Override
    public int getDriverMajorVersion() {
        String v;
        try {
            v = getDriverVersion();
        } catch (SQLException sqle) {
            log.warn("Error determining driver major version", sqle);
            return 0;
        }
        return ClickHouseVersion.of(v).getMajorVersion();
    }

    @Override
    public int getDriverMinorVersion() {
        String v;
        try {
            v = getDriverVersion();
        } catch (SQLException sqle) {
            log.warn("Error determining driver minor version", sqle);
            return 0;
        }
        return ClickHouseVersion.of(v).getMinorVersion();
    }

    @Override
    public boolean usesLocalFiles() throws SQLException {
        return false;
    }

    @Override
    public boolean usesLocalFilePerTable() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsMixedCaseIdentifiers() throws SQLException {
        return true;
    }

    @Override
    public boolean storesUpperCaseIdentifiers() throws SQLException {
        return false;
    }

    @Override
    public boolean storesLowerCaseIdentifiers() throws SQLException {
        return false;
    }

    @Override
    public boolean storesMixedCaseIdentifiers() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsMixedCaseQuotedIdentifiers() throws SQLException {
        return true;
    }

    @Override
    public boolean storesUpperCaseQuotedIdentifiers() throws SQLException {
        return false;
    }

    @Override
    public boolean storesLowerCaseQuotedIdentifiers() throws SQLException {
        return false;
    }

    @Override
    public boolean storesMixedCaseQuotedIdentifiers() throws SQLException {
        return true;
    }

    @Override
    public String getIdentifierQuoteString() throws SQLException {
        return "`";
    }

    @Override
    public String getSQLKeywords() throws SQLException {
        return "GLOBAL,ARRAY";
    }

    @Override
    public String getNumericFunctions() throws SQLException {
        return "";
    }

    @Override
    public String getStringFunctions() throws SQLException {
        return "";
    }

    @Override
    public String getSystemFunctions() throws SQLException {
        return "";
    }

    @Override
    public String getTimeDateFunctions() throws SQLException {
        return "";
    }

    @Override
    public String getSearchStringEscape() throws SQLException {
        return "\\";
    }

    @Override
    public String getExtraNameCharacters() throws SQLException {
        return "";
    }

    @Override
    public boolean supportsAlterTableWithAddColumn() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsAlterTableWithDropColumn() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsColumnAliasing() throws SQLException {
        return true;
    }

    @Override
    public boolean nullPlusNonNullIsNull() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsConvert() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsConvert(int fromType, int toType) throws SQLException {
        return false;
    }

    @Override
    public boolean supportsTableCorrelationNames() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsDifferentTableCorrelationNames() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsExpressionsInOrderBy() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsOrderByUnrelated() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsGroupBy() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsGroupByUnrelated() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsGroupByBeyondSelect() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsLikeEscapeClause() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsMultipleResultSets() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsMultipleTransactions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsNonNullableColumns() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsMinimumSQLGrammar() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCoreSQLGrammar() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsExtendedSQLGrammar() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsANSI92EntryLevelSQL() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsANSI92IntermediateSQL() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsANSI92FullSQL() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsIntegrityEnhancementFacility() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsOuterJoins() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsFullOuterJoins() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsLimitedOuterJoins() throws SQLException {
        return true;
    }

    @Override
    public String getSchemaTerm() throws SQLException {
        return "database";
    }

    @Override
    public String getProcedureTerm() throws SQLException {
        return "procedure";
    }

    @Override
    public String getCatalogTerm() throws SQLException {
        return "catalog";
    }

    @Override
    public boolean isCatalogAtStart() throws SQLException {
        return false;
    }

    @Override
    public String getCatalogSeparator() throws SQLException {
        return ".";
    }

    @Override
    public boolean supportsSchemasInDataManipulation() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSchemasInProcedureCalls() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSchemasInTableDefinitions() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSchemasInIndexDefinitions() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSchemasInPrivilegeDefinitions() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsCatalogsInDataManipulation() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCatalogsInProcedureCalls() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCatalogsInTableDefinitions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCatalogsInIndexDefinitions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCatalogsInPrivilegeDefinitions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsPositionedDelete() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsPositionedUpdate() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsSelectForUpdate() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsStoredProcedures() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsSubqueriesInComparisons() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSubqueriesInExists() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsSubqueriesInIns() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsSubqueriesInQuantifieds() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsCorrelatedSubqueries() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsUnion() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsUnionAll() throws SQLException {
        return true;
    }

    @Override
    public boolean supportsOpenCursorsAcrossCommit() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsOpenCursorsAcrossRollback() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsOpenStatementsAcrossCommit() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsOpenStatementsAcrossRollback() throws SQLException {
        return false;
    }

    @Override
    public int getMaxBinaryLiteralLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxCharLiteralLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnsInGroupBy() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnsInIndex() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnsInOrderBy() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnsInSelect() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxColumnsInTable() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxConnections() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxCursorNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxIndexLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxSchemaNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxProcedureNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxCatalogNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxRowSize() throws SQLException {
        return 0;
    }

    @Override
    public boolean doesMaxRowSizeIncludeBlobs() throws SQLException {
        return false;
    }

    @Override
    public int getMaxStatementLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxStatements() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxTableNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxTablesInSelect() throws SQLException {
        return 0;
    }

    @Override
    public int getMaxUserNameLength() throws SQLException {
        return 0;
    }

    @Override
    public int getDefaultTransactionIsolation() throws SQLException {
        return Connection.TRANSACTION_NONE;
    }

    @Override
    public boolean supportsTransactions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsTransactionIsolationLevel(int level) throws SQLException {
        return level == Connection.TRANSACTION_NONE;
    }

    @Override
    public boolean supportsDataDefinitionAndDataManipulationTransactions() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsDataManipulationTransactionsOnly() throws SQLException {
        return false;
    }

    @Override
    public boolean dataDefinitionCausesTransactionCommit() throws SQLException {
        return false;
    }

    @Override
    public boolean dataDefinitionIgnoredInTransactions() throws SQLException {
        return false;
    }

    private ResultSet request(String sql) throws SQLException {
        Statement statement = connection.createStatement();
        return statement.executeQuery(sql);
    }

    @Override
    public ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern) throws SQLException {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(9);
        builder.names(
                "PROCEDURE_CAT",
                "PROCEDURE_SCHEM",
                "PROCEDURE_NAME",
                "RES_1",
                "RES_2",
                "RES_3",
                "REMARKS",
                "PROCEDURE_TYPE",
                "SPECIFIC_NAME"
        );

        builder.types(
                "String",
                "String",
                "String",
                "String",
                "String",
                "String",
                "String",
                "UInt8",
                "String"
        );

        return builder.build();
    }

    @Override
    public ResultSet getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern, String columnNamePattern) throws SQLException {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(20);
        builder.names("1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20");

        builder.types("UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32", "UInt32");

        return builder.build();
    }

    @Override
    public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) throws SQLException {
        /*
         TABLE_CAT String => table catalog (may be null)
         TABLE_SCHEM String => table schema (may be null)
         TABLE_NAME String => table name
         TABLE_TYPE String => table type. Typical types are "TABLE", "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS", "SYNONYM".
         REMARKS String => explanatory comment on the table
         TYPE_CAT String => the types catalog (may be null)
         TYPE_SCHEM String => the types schema (may be null)
         TYPE_NAME String => type name (may be null)
         SELF_REFERENCING_COL_NAME String => name of the designated "identifier" column of a typed table (may be null)
         REF_GENERATION String => specifies how values in SELF_REFERENCING_COL_NAME are created. Values are "SYSTEM", "USER", "DERIVED". (may be null)
         */
        String sql = "select " +
                "database, name, engine " +
                "from system.tables " +
                "where 1 = 1";
        if (schemaPattern != null) {
            sql += " and database like '" + schemaPattern + "'";
        }
        if (tableNamePattern != null) {
            sql += " and name like '" + tableNamePattern + "'";
        }
        sql += " order by database, name";
        ResultSet result = request(sql);

        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(10);
        builder.names("TABLE_CAT", "TABLE_SCHEM", "TABLE_NAME", "TABLE_TYPE", "REMARKS", "TYPE_CAT", "TYPE_SCHEM", "TYPE_NAME", "SELF_REFERENCING_COL_NAME", "REF_GENERATION");
        builder.types("String", "String", "String", "String", "String", "String", "String", "String", "String", "String");

        List typeList = types != null ? Arrays.asList(types) : null;
        while (result.next()) {
            List row = new ArrayList<>();
            row.add(DEFAULT_CAT);
            row.add(result.getString(1));
            row.add(result.getString(2));
            String type, e = result.getString(3).intern();
            if (e == "View" || e == "MaterializedView" || e == "Merge" || e == "Distributed" || e == "Null") {
                type = "VIEW"; // some kind of view
            } else if (e == "Set" || e == "Join" || e == "Buffer") {
                type = "OTHER"; // not a real table
            } else {
                type = "TABLE";
            }
            row.add(type);
            for (int i = 3; i < 9; i++) {
                row.add(null);
            }
            if (typeList == null || typeList.contains(type)) {
                builder.addRow(row);
            }
        }
        result.close();
        return builder.build();
    }

    @Override
    public ResultSet getSchemas() throws SQLException {
        return getSchemas(null, null);
    }

    @Override
    public ResultSet getSchemas(String catalog, String schemaPattern) throws SQLException {
        String sql = "select name as TABLE_SCHEM, '" +
                DEFAULT_CAT + "' as TABLE_CATALOG from system.databases";
        if (catalog != null) {
            sql += " where TABLE_CATALOG = '" + catalog + '\'';
        }
        if (schemaPattern != null) {
            if (catalog != null) {
                sql += " and ";
            } else {
                sql += " where ";
            }
            sql += "name LIKE '" + schemaPattern + '\'';
        }
        return request(sql);
    }

    @Override
    public ResultSet getCatalogs() throws SQLException {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(1);
        builder.names("TABLE_CAT");
        builder.types("String");

        builder.addRow(DEFAULT_CAT);
        return builder.build();
    }

    @Override
    public ResultSet getTableTypes() throws SQLException {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(1);
        builder.names("TABLE_TYPE");
        builder.types("String");

        builder.addRow("TABLE");
        builder.addRow("VIEW");
        builder.addRow("OTHER");
        return builder.build();
    }

    private static void buildAndCondition(StringBuilder dest, List conditions) {
        Iterator iter = conditions.iterator();
        if (iter.hasNext()) {
            String entry = iter.next();
            dest.append(entry);
        }
        while (iter.hasNext()) {
            String entry = iter.next();
            dest.append(" AND ").append(entry);
        }
    }

    @Override
    public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException {
        StringBuilder query;
        if (ClickHouseVersion.check(connection.getServerVersion(), "[18.16,)")) {
            query = new StringBuilder(
                "SELECT database, table, name, type, default_kind as default_type, default_expression, comment ");
        } else {
            query = new StringBuilder(
                "SELECT database, table, name, type, default_kind as default_type, default_expression, NULL AS comment ");
        }
        query.append("FROM system.columns ");
        List predicates = new ArrayList<>();
        if (schemaPattern != null) {
            predicates.add("database LIKE '" + schemaPattern + "' ");
        }
        if (tableNamePattern != null) {
            predicates.add("table LIKE '" + tableNamePattern + "' ");
        }
        if (columnNamePattern != null) {
            predicates.add("name LIKE '" + columnNamePattern + "' ");
        }
        if (!predicates.isEmpty()) {
            query.append(" WHERE ");
            buildAndCondition(query, predicates);
        }
        ClickHouseResultBuilder builder = getClickHouseResultBuilderForGetColumns();
        ResultSet descTable = request(query.toString());
        int colNum = 1;
        while (descTable.next()) {
            List row = new ArrayList<>();
            //catalog name
            row.add(DEFAULT_CAT);
            //database name
            row.add(descTable.getString("database"));
            //table name
            row.add(descTable.getString("table"));
            //column name
            ClickHouseColumnInfo columnInfo = ClickHouseColumnInfo.parse(
                descTable.getString("type"),
                descTable.getString("name"),
                connection.getServerTimeZone());
            row.add(columnInfo.getColumnName());
            //data type
            row.add(String.valueOf(columnInfo.getClickHouseDataType().getSqlType()));
            //type name
            row.add(columnInfo.getCleanTypeName());
            // column size / precision
            row.add(String.valueOf(columnInfo.getPrecision()));
            //buffer length
            row.add("0");
            // decimal digits
            row.add(String.valueOf(columnInfo.getScale()));
            // radix
            row.add("10");
            // nullable
            row.add(columnInfo.isNullable()
                ? String.valueOf(columnNullable)
                : String.valueOf(columnNoNulls));
            //remarks
            String remarks = descTable.getString("comment");
            row.add("".equals(remarks)
                ? null
                : remarks);

            // COLUMN_DEF
            if ("DEFAULT".equals(descTable.getString("default_type"))) {
                row.add(descTable.getString("default_expression"));
            } else {
                row.add(null);
            }

            //"SQL_DATA_TYPE", unused per JavaDoc
            row.add(null);
            //"SQL_DATETIME_SUB", unused per JavaDoc
            row.add(null);

            // char octet length
            row.add("0");
            // ordinal
            row.add(String.valueOf(colNum));
            colNum += 1;

            //IS_NULLABLE
            row.add(columnInfo.isNullable()
                ? "YES"
                : "NO");
            //"SCOPE_CATALOG",
            row.add(null);
            //"SCOPE_SCHEMA",
            row.add(null);
            //"SCOPE_TABLE",
            row.add(null);
            //"SOURCE_DATA_TYPE",
            row.add(null);
            //"IS_AUTOINCREMENT"
            row.add("NO");
            //"IS_GENERATEDCOLUMN"
            row.add("NO");

            builder.addRow(row);
        }
        descTable.close();
        return builder.build();
    }

    private ClickHouseResultBuilder getClickHouseResultBuilderForGetColumns() {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(24);
        builder.names(
                "TABLE_CAT",
                "TABLE_SCHEM",
                "TABLE_NAME",
                "COLUMN_NAME",
                "DATA_TYPE",
                "TYPE_NAME",
                "COLUMN_SIZE",
                "BUFFER_LENGTH",
                "DECIMAL_DIGITS",
                "NUM_PREC_RADIX",
                "NULLABLE",
                "REMARKS",
                "COLUMN_DEF",
                "SQL_DATA_TYPE",
                "SQL_DATETIME_SUB",
                "CHAR_OCTET_LENGTH",
                "ORDINAL_POSITION",
                "IS_NULLABLE",
                "SCOPE_CATALOG",
                "SCOPE_SCHEMA",
                "SCOPE_TABLE",
                "SOURCE_DATA_TYPE",
                "IS_AUTOINCREMENT",
                "IS_GENERATEDCOLUMN"
        );
        builder.types(
                "String",
                "String",
                "String",
                "String",
                "Int32",
                "String",
                "Int32",
                "Int32",
                "Int32",
                "Int32",
                "Int32",
                "String",
                "String",
                "Int32",
                "Int32",
                "Int32",
                "Int32",
                "String",
                "String",
                "String",
                "String",
                "Int32",
                "String",
                "String"
        );
        return builder;
    }

    private ResultSet getEmptyResultSet() {
        return ClickHouseResultBuilder.builder(1).names("some").types("String").build();
    }

    @Override
    public ResultSet getColumnPrivileges(String catalog, String schema, String table, String columnNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getTablePrivileges(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getVersionColumns(String catalog, String schema, String table) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getImportedKeys(String catalog, String schema, String table) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getExportedKeys(String catalog, String schema, String table) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getCrossReference(String parentCatalog, String parentSchema, String parentTable, String foreignCatalog, String foreignSchema, String foreignTable) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getTypeInfo() throws SQLException {
        ClickHouseResultBuilder builder = ClickHouseResultBuilder.builder(18);
        builder.names(
                "TYPE_NAME",
                "DATA_TYPE",
                "PRECISION",
                "LITERAL_PREFIX",
                "LITERAL_SUFFIX",
                "CREATE_PARAMS",
                "NULLABLE",
                "CASE_SENSITIVE",
                "SEARCHABLE",
                "UNSIGNED_ATTRIBUTE",
                "FIXED_PREC_SCALE",
                "AUTO_INCREMENT",
                "LOCAL_TYPE_NAME",
                "MINIMUM_SCALE",
                "MAXIMUM_SCALE",
                "SQL_DATA_TYPE",
                "SQL_DATETIME_SUB",
                "NUM_PREC_RADIX"
        );
        builder.types(
                "String",
                "Int32",
                "Int32",
                "String",
                "String",
                "String",
                "Int32",
                "Int8",
                "Int32",
                "Int8",
                "Int8",
                "Int8",
                "String",
                "Int32",
                "Int32",
                "Int32",
                "Int32",
                "Int32"
        );
        builder.addRow(
                "String", Types.VARCHAR,
                null, // precision - todo
                '\'', '\'', null,
                typeNoNulls, true, typeSearchable,
                true, // unsigned
                true, // fixed precision (money)
                false, //auto-incr
                null,
                null, null, // scale - should be fixed
                null, null,
                10
                );
        int[] sizes = { 8, 16, 32, 64 };
        boolean[] signed = { true, false };
        for (int size : sizes) {
            for (boolean b: signed) {
                String name = (b ? "" : "U") + "Int" + size;
                builder.addRow(
                        name, (size <= 16 ? Types.INTEGER : Types.BIGINT),
                        null, // precision - todo
                        null, null, null,
                        typeNoNulls, true, typePredBasic,
                        !b, // unsigned
                        true, // fixed precision (money)
                        false, //auto-incr
                        null,
                        null, null, // scale - should be fixed
                        null, null,
                        10
                );
            }
        }
        int[] floatSizes = { 32, 64 };
        for (int floatSize : floatSizes) {
            String name = "Float" + floatSize;
            builder.addRow(
                    name, Types.FLOAT,
                    null, // precision - todo
                    null, null, null,
                    typeNoNulls, true, typePredBasic,
                    false, // unsigned
                    true, // fixed precision (money)
                    false, //auto-incr
                    null,
                    null, null, // scale - should be fixed
                    null, null,
                    10
            );
        }
        builder.addRow(
                "Date", Types.DATE,
                null, // precision - todo
                null, null, null,
                typeNoNulls, true, typePredBasic,
                false, // unsigned
                true, // fixed precision (money)
                false, //auto-incr
                null,
                null, null, // scale - should be fixed
                null, null,
                10
        );
        builder.addRow(
                "DateTime", Types.TIMESTAMP,
                null, // precision - todo
                null, null, null,
                typeNoNulls, true, typePredBasic,
                false, // unsigned
                true, // fixed precision (money)
                false, //auto-incr
                null,
                null, null, // scale - should be fixed
                null, null,
                10
        );
        return builder.build();
    }

    @Override
    public ResultSet getIndexInfo(String catalog, String schema, String table, boolean unique, boolean approximate) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public boolean supportsResultSetType(int type) throws SQLException {
        return ResultSet.TYPE_FORWARD_ONLY == type;
    }

    @Override
    public boolean supportsResultSetConcurrency(int type, int concurrency) throws SQLException {
        return false;
    }

    @Override
    public boolean ownUpdatesAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean ownDeletesAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean ownInsertsAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean othersUpdatesAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean othersDeletesAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean othersInsertsAreVisible(int type) throws SQLException {
        return true;
    }

    @Override
    public boolean updatesAreDetected(int type) throws SQLException {
        return false;
    }

    @Override
    public boolean deletesAreDetected(int type) throws SQLException {
        return false;
    }

    @Override
    public boolean insertsAreDetected(int type) throws SQLException {
        return false;
    }

    @Override
    public boolean supportsBatchUpdates() throws SQLException {
        return true;
    }

    @Override
    public ResultSet getUDTs(String catalog, String schemaPattern, String typeNamePattern, int[] types) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public Connection getConnection() throws SQLException {
        return connection;
    }

    @Override
    public boolean supportsSavepoints() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsNamedParameters() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsMultipleOpenResults() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsGetGeneratedKeys() throws SQLException {
        return false;
    }

    @Override
    public ResultSet getSuperTypes(String catalog, String schemaPattern, String typeNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getSuperTables(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getAttributes(String catalog, String schemaPattern, String typeNamePattern, String attributeNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public boolean supportsResultSetHoldability(int holdability) throws SQLException {
        return false;
    }

    @Override
    public int getResultSetHoldability() throws SQLException {
        return 0;
    }

    @Override
    public int getDatabaseMajorVersion() throws SQLException {
        return ClickHouseVersion.of(connection.getServerVersion()).getMajorVersion();
    }

    @Override
    public int getDatabaseMinorVersion() throws SQLException {
        return ClickHouseVersion.of(connection.getServerVersion()).getMinorVersion();
    }

    @Override
    public int getJDBCMajorVersion() throws SQLException {
        return 0;
    }

    @Override
    public int getJDBCMinorVersion() throws SQLException {
        return 1;
    }

    @Override
    public int getSQLStateType() throws SQLException {
        return sqlStateSQL;
    }

    @Override
    public boolean locatorsUpdateCopy() throws SQLException {
        return false;
    }

    @Override
    public boolean supportsStatementPooling() throws SQLException {
        return false;
    }

    @Override
    public RowIdLifetime getRowIdLifetime() throws SQLException {
        return RowIdLifetime.ROWID_UNSUPPORTED;
    }

    @Override
    public boolean supportsStoredFunctionsUsingCallSyntax() throws SQLException {
        return false;
    }

    @Override
    public boolean autoCommitFailureClosesAllResultSets() throws SQLException {
        return false;
    }

    @Override
    public ResultSet getClientInfoProperties() throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getFunctions(String catalog, String schemaPattern, String functionNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public ResultSet getFunctionColumns(String catalog, String schemaPattern, String functionNamePattern, String columnNamePattern) throws SQLException {
        return getEmptyResultSet();
    }

    @Override
    public  T unwrap(Class iface) throws SQLException {
        if (iface.isAssignableFrom(getClass())) {
            return iface.cast(this);
        }
        throw new SQLException("Cannot unwrap to " + iface.getName());
    }

    @Override
    public boolean isWrapperFor(Class iface) throws SQLException {
        return iface.isAssignableFrom(getClass());
    }

    @Override
    public ResultSet getPseudoColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException {
        return null;
    }

    @Override
    public boolean generatedKeyAlwaysReturned() throws SQLException {
        return false;
    }

}