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com.hazelcast.org.apache.calcite.sql.dialect.ExasolSqlDialect Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.sql.dialect;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlBasicTypeNameSpec;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlDataTypeSpec;
import com.hazelcast.org.apache.calcite.sql.SqlDialect;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.com.google.common.collect.ImmutableList;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;
/**
* A SqlDialect implementation for the Exasol database.
*/
public class ExasolSqlDialect extends SqlDialect {
public static final SqlDialect.Context DEFAULT_CONTEXT =
SqlDialect.EMPTY_CONTEXT
.withDatabaseProduct(DatabaseProduct.EXASOL)
.withIdentifierQuoteString("\"");
public static final SqlDialect DEFAULT = new ExasolSqlDialect(DEFAULT_CONTEXT);
/** An unquoted Exasol identifier must start with a letter and be followed
* by zero or more letters, digits or _. */
private static final Pattern IDENTIFIER_REGEX =
Pattern.compile("[A-Za-z][A-Za-z0-9_]*");
private static final List RESERVED_KEYWORDS =
ImmutableList.of("ABS", "ACCESS", "ACOS", "ADAPTER", "ADD_DAYS",
"ADD_HOURS", "ADD_MINUTES", "ADD_MONTHS", "ADD_SECONDS", "ADD_WEEKS",
"ADD_YEARS", "ADMIN", "ALIGN", "ALWAYS", "ANALYZE", "ANSI",
"APPROXIMATE_COUNT_DISTINCT", "ASCII", "ASIN", "ASSIGNMENT",
"ASYMMETRIC", "ATAN", "ATAN2", "ATOMIC", "ATTEMPTS", "AUDIT",
"AUTHENTICATED", "AUTO", "AVG", "BACKUP", "BERNOULLI", "BIT_AND",
"BIT_CHECK", "BIT_LENGTH", "BIT_LROTATE", "BIT_LSHIFT", "BIT_NOT",
"BIT_OR", "BIT_RROTATE", "BIT_RSHIFT", "BIT_SET", "BIT_TO_NUM",
"BIT_XOR", "BREADTH", "CEIL", "CEILING", "CHANGE", "CHARACTERS",
"CHARACTER_LENGTH", "CHR", "CLEAR", "COBOL", "COLOGNE_PHONETIC",
"COMMENT", "COMMENTS", "COMMITTED", "CONCAT", "CONNECT", "CONVERT_TZ",
"CORR", "COS", "COSH", "COT", "COUNT", "COVAR_POP", "COVAR_SAMP",
"CREATED", "CROSS", "CURDATE", "DATABASE", "DATE_TRUNC",
"DAYS_BETWEEN", "DECODE", "DEFAULTS", "DEFAULT_PRIORITY_GROUP",
"DEGREES", "DELIMIT", "DELIMITER", "DENSE_RANK", "DEPTH",
"DIAGNOSTICS", "DICTIONARY", "DISTRIBUTE", "DISTRIBUTION", "DIV",
"DOWN", "DUMP", "EDIT_DISTANCE", "ENCODING", "ESTIMATE", "EVALUATE",
"EVERY", "EXA", "EXCLUDE", "EXCLUDING", "EXP", "EXPIRE", "EXPLAIN",
"EXPRESSION", "FAILED", "FIRST_VALUE", "FLOOR", "FLUSH", "FOREIGN",
"FORTRAN", "FROM_POSIX_TIME", "GREATEST", "GROUPING_ID", "HANDLER",
"HAS", "HASH", "HASH_MD5", "HASH_SHA", "HASH_SHA1", "HASH_SHA256",
"HASH_SHA512", "HASH_TIGER", "HIERARCHY", "HOURS_BETWEEN",
"IDENTIFIED", "IGNORE", "IMPERSONATION", "INCLUDING", "INITCAP",
"INITIALLY", "INSTR", "INVALID", "IPROC", "ISOLATION", "IS_BOOLEAN",
"IS_DATE", "IS_DSINTERVAL", "IS_NUMBER", "IS_TIMESTAMP",
"IS_YMINTERVAL", "JAVA", "JAVASCRIPT", "KEEP", "KEY", "KEYS", "KILL",
"LAG", "LANGUAGE", "LAST_VALUE", "LCASE", "LEAD", "LEAST", "LENGTH",
"LINK", "LN", "LOCATE", "LOCK", "LOG10", "LOG2", "LOGIN", "LOGS",
"LONG", "LOWER", "LPAD", "LTRIM", "LUA", "MANAGE", "MAX", "MAXIMAL",
"MEDIAN", "MID", "MIN", "MINUTES_BETWEEN", "MONTHS_BETWEEN", "MUMPS",
"NEVER", "NICE", "NORMALIZED", "NOW", "NPROC", "NULLIFZERO", "NULLS",
"NUMTODSINTERVAL", "NUMTOYMINTERVAL", "NVL", "NVL2", "OCTETS",
"OCTET_LENGTH", "OFFSET", "OPTIMIZE", "ORA", "OWNER", "PADDING",
"PARTITION", "PASCAL", "PASSWORD", "PASSWORD_EXPIRY_POLICY",
"PASSWORD_SECURITY_POLICY", "PERCENTILE_CONT", "PERCENTILE_DISC",
"PI", "PLI", "POSIX_TIME", "POWER", "PRECISION", "PRELOAD", "PRIMARY",
"PRIORITY", "PRIVILEGE", "PYTHON", "QUERY_CACHE", "QUERY_TIMEOUT",
"R", "RADIANS", "RAND", "RANK", "RATIO_TO_REPORT", "RAW_SIZE_LIMIT",
"RECOMPRESS", "RECORD", "REGEXP_INSTR", "REGEXP_REPLACE",
"REGEXP_SUBSTR", "REGR_AVGX", "REGR_AVGY", "REGR_COUNT",
"REGR_INTERCEPT", "REGR_R2", "REGR_SLOPE", "REGR_SXX", "REGR_SXY",
"REGR_SYY", "REJECT", "REORGANIZE", "REPEATABLE", "RESET", "REVERSE",
"ROLE", "ROUND", "ROWID", "ROW_NUMBER", "RPAD", "RTRIM", "SCALAR",
"SCHEMAS", "SCHEME", "SCRIPT_LANGUAGES", "SCRIPT_OUTPUT_ADDRESS",
"SECONDS_BETWEEN", "SECURE", "SERIALIZABLE", "SHUT", "SIGN", "SIMPLE",
"SIN", "SINH", "SIZE", "SKIP", "SOUNDEX", "SQRT", "STATISTICS",
"STDDEV", "STDDEV_POP", "STDDEV_SAMP", "ST_AREA", "ST_BOUNDARY",
"ST_BUFFER", "ST_CENTROID", "ST_CONTAINS", "ST_CONVEXHULL",
"ST_CROSSES", "ST_DIFFERENCE", "ST_DIMENSION", "ST_DISJOINT",
"ST_DISTANCE", "ST_ENDPOINT", "ST_ENVELOPE", "ST_EQUALS",
"ST_EXTERIORRING", "ST_FORCE2D", "ST_GEOMETRYN", "ST_GEOMETRYTYPE",
"ST_INTERIORRINGN", "ST_INTERSECTION", "ST_INTERSECTS", "ST_ISCLOSED",
"ST_ISEMPTY", "ST_ISRING", "ST_ISSIMPLE", "ST_LENGTH",
"ST_NUMGEOMETRIES", "ST_NUMINTERIORRINGS", "ST_NUMPOINTS",
"ST_OVERLAPS", "ST_POINTN", "ST_SETSRID", "ST_STARTPOINT",
"ST_SYMDIFFERENCE", "ST_TOUCHES", "ST_TRANSFORM", "ST_UNION",
"ST_WITHIN", "ST_X", "ST_Y", "SUBSTR", "SUM", "SYMMETRIC",
"SYS_CONNECT_BY_PATH", "SYS_GUID", "TABLES", "TABLESAMPLE", "TAN",
"TANH", "TASKS", "TIES", "TIMESTAMP_ARITHMETIC_BEHAVIOR", "TIME_ZONE",
"TIME_ZONE_BEHAVIOR", "TO_CHAR", "TO_DATE", "TO_DSINTERVAL",
"TO_NUMBER", "TO_TIMESTAMP", "TO_YMINTERVAL", "TRANSLATE", "TRUNC",
"TYPE", "UCASE", "UNBOUNDED", "UNCOMMITTED", "UNDO", "UNICODE",
"UNICODECHR", "UNLIMITED", "UPPER", "UTF8", "VALUE2PROC", "VARIANCE",
"VARYING", "VAR_POP", "VAR_SAMP", "VIRTUAL", "WEEK", "WEIGHT",
"WRITE", "YEARS_BETWEEN", "ZEROIFNULL");
/** Creates a ExasolSqlDialect. */
public ExasolSqlDialect(Context context) {
super(context);
}
@Override public boolean supportsCharSet() {
return false;
}
@Override public boolean supportsNestedAggregations() {
return false;
}
@Override public boolean supportsAggregateFunctionFilter() {
return false;
}
@Override public boolean supportsAggregateFunction(SqlKind kind) {
switch (kind) {
case AVG:
case COUNT:
case COVAR_POP:
case COVAR_SAMP:
case MAX:
case MIN:
case STDDEV_POP:
case STDDEV_SAMP:
case SUM:
case VAR_POP:
case VAR_SAMP:
return true;
default:
return false;
}
}
@Override protected boolean identifierNeedsQuote(String val) {
return !IDENTIFIER_REGEX.matcher(val).matches()
|| RESERVED_KEYWORDS.contains(val.toUpperCase(Locale.ROOT));
}
@Override public @Nullable SqlNode getCastSpec(RelDataType type) {
switch (type.getSqlTypeName()) {
case TIMESTAMP:
// Exasol does not support TIMESTAMP with precision.
return new SqlDataTypeSpec(
new SqlBasicTypeNameSpec(type.getSqlTypeName(), SqlParserPos.ZERO),
SqlParserPos.ZERO);
default:
return super.getCastSpec(type);
}
}
@Override public void unparseOffsetFetch(SqlWriter writer, @Nullable SqlNode offset,
@Nullable SqlNode fetch) {
unparseFetchUsingLimit(writer, offset, fetch);
}
@Override public void unparseCall(SqlWriter writer, SqlCall call,
int leftPrec, int rightPrec) {
// Same as PostgreSQL implementation
PostgresqlSqlDialect.DEFAULT.unparseCall(writer, call, leftPrec, rightPrec);
}
}
