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/*
* 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.avatica.util.Casing;
import com.hazelcast.org.apache.calcite.avatica.util.TimeUnit;
import com.hazelcast.org.apache.calcite.avatica.util.TimeUnitRange;
import com.hazelcast.org.apache.calcite.config.NullCollation;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeSystem;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeSystemImpl;
import com.hazelcast.org.apache.calcite.sql.SqlAlienSystemTypeNameSpec;
import com.hazelcast.org.apache.calcite.sql.SqlBasicCall;
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.SqlFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlIntervalQualifier;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlLiteral;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlNodeList;
import com.hazelcast.org.apache.calcite.sql.SqlSelect;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.fun.SqlCase;
import com.hazelcast.org.apache.calcite.sql.fun.SqlStdOperatorTable;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.type.InferTypes;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.TIMESTAMP;
/**
* A SqlDialect implementation for the MySQL database.
*/
public class MysqlSqlDialect extends SqlDialect {
/** MySQL type system. */
public static final RelDataTypeSystem MYSQL_TYPE_SYSTEM =
new RelDataTypeSystemImpl() {
@Override public int getMaxPrecision(SqlTypeName typeName) {
switch (typeName) {
case CHAR:
return 255;
case VARCHAR:
return 65535;
case TIMESTAMP:
return 6;
default:
return super.getMaxPrecision(typeName);
}
}
};
public static final SqlDialect.Context DEFAULT_CONTEXT = SqlDialect.EMPTY_CONTEXT
.withDatabaseProduct(SqlDialect.DatabaseProduct.MYSQL)
.withIdentifierQuoteString("`")
.withDataTypeSystem(MYSQL_TYPE_SYSTEM)
.withUnquotedCasing(Casing.UNCHANGED)
.withNullCollation(NullCollation.LOW);
public static final SqlDialect DEFAULT = new MysqlSqlDialect(DEFAULT_CONTEXT);
/** MySQL specific function. */
public static final SqlFunction ISNULL_FUNCTION =
new SqlFunction("ISNULL", SqlKind.OTHER_FUNCTION,
ReturnTypes.BOOLEAN, InferTypes.FIRST_KNOWN,
OperandTypes.ANY, SqlFunctionCategory.SYSTEM);
private final int majorVersion;
/** Creates a MysqlSqlDialect. */
public MysqlSqlDialect(Context context) {
super(context);
majorVersion = context.databaseMajorVersion();
}
@Override public boolean supportsCharSet() {
return false;
}
@Override public boolean requiresAliasForFromItems() {
return true;
}
public boolean supportsAliasedValues() {
// MySQL supports VALUES only in INSERT; not in a FROM clause
return false;
}
@Override public void unparseOffsetFetch(SqlWriter writer, SqlNode offset,
SqlNode fetch) {
unparseFetchUsingLimit(writer, offset, fetch);
}
@Override public SqlNode emulateNullDirection(SqlNode node,
boolean nullsFirst, boolean desc) {
return emulateNullDirectionWithIsNull(node, nullsFirst, desc);
}
@Override public boolean supportsAggregateFunction(SqlKind kind) {
switch (kind) {
case COUNT:
case SUM:
case SUM0:
case MIN:
case MAX:
case SINGLE_VALUE:
return true;
case ROLLUP:
// MySQL 5 does not support standard "GROUP BY ROLLUP(x, y)",
// only the non-standard "GROUP BY x, y WITH ROLLUP".
return majorVersion >= 8;
}
return false;
}
@Override public boolean supportsNestedAggregations() {
return false;
}
@Override public boolean supportsGroupByWithRollup() {
return true;
}
@Override public CalendarPolicy getCalendarPolicy() {
return CalendarPolicy.SHIFT;
}
@Override public SqlNode getCastSpec(RelDataType type) {
switch (type.getSqlTypeName()) {
case VARCHAR:
// MySQL doesn't have a VARCHAR type, only CHAR.
int vcMaxPrecision = this.getTypeSystem().getMaxPrecision(SqlTypeName.CHAR);
int precision = type.getPrecision();
if (vcMaxPrecision > 0 && precision > vcMaxPrecision) {
precision = vcMaxPrecision;
}
return new SqlDataTypeSpec(
new SqlBasicTypeNameSpec(SqlTypeName.CHAR, precision, SqlParserPos.ZERO),
SqlParserPos.ZERO);
case INTEGER:
case BIGINT:
return new SqlDataTypeSpec(
new SqlAlienSystemTypeNameSpec(
"SIGNED",
type.getSqlTypeName(),
SqlParserPos.ZERO),
SqlParserPos.ZERO);
case TIMESTAMP:
return new SqlDataTypeSpec(
new SqlAlienSystemTypeNameSpec(
"DATETIME",
type.getSqlTypeName(),
SqlParserPos.ZERO),
SqlParserPos.ZERO);
}
return super.getCastSpec(type);
}
@Override public SqlNode rewriteSingleValueExpr(SqlNode aggCall) {
final SqlNode operand = ((SqlBasicCall) aggCall).operand(0);
final SqlLiteral nullLiteral = SqlLiteral.createNull(SqlParserPos.ZERO);
final SqlNode unionOperand = new SqlSelect(SqlParserPos.ZERO, SqlNodeList.EMPTY,
SqlNodeList.of(nullLiteral), null, null, null, null,
SqlNodeList.EMPTY, null, null, null, SqlNodeList.EMPTY);
// For MySQL, generate
// CASE COUNT(*)
// WHEN 0 THEN NULL
// WHEN 1 THEN
// ELSE (SELECT NULL UNION ALL SELECT NULL)
// END
final SqlNode caseExpr =
new SqlCase(SqlParserPos.ZERO,
SqlStdOperatorTable.COUNT.createCall(SqlParserPos.ZERO, operand),
SqlNodeList.of(
SqlLiteral.createExactNumeric("0", SqlParserPos.ZERO),
SqlLiteral.createExactNumeric("1", SqlParserPos.ZERO)),
SqlNodeList.of(
nullLiteral,
operand),
SqlStdOperatorTable.SCALAR_QUERY.createCall(SqlParserPos.ZERO,
SqlStdOperatorTable.UNION_ALL
.createCall(SqlParserPos.ZERO, unionOperand, unionOperand)));
LOGGER.debug("SINGLE_VALUE rewritten into [{}]", caseExpr);
return caseExpr;
}
@Override public void unparseCall(SqlWriter writer, SqlCall call,
int leftPrec, int rightPrec) {
switch (call.getKind()) {
case FLOOR:
if (call.operandCount() != 2) {
super.unparseCall(writer, call, leftPrec, rightPrec);
return;
}
unparseFloor(writer, call);
break;
default:
super.unparseCall(writer, call, leftPrec, rightPrec);
}
}
/**
* Unparses datetime floor for MySQL. There is no TRUNC function, so simulate
* this using calls to DATE_FORMAT.
*
* @param writer Writer
* @param call Call
*/
private void unparseFloor(SqlWriter writer, SqlCall call) {
SqlLiteral node = call.operand(1);
TimeUnitRange unit = (TimeUnitRange) node.getValue();
if (unit == TimeUnitRange.WEEK) {
writer.print("STR_TO_DATE");
SqlWriter.Frame frame = writer.startList("(", ")");
writer.print("DATE_FORMAT(");
call.operand(0).unparse(writer, 0, 0);
writer.print(", '%x%v-1'), '%x%v-%w'");
writer.endList(frame);
return;
}
String format;
switch (unit) {
case YEAR:
format = "%Y-01-01";
break;
case MONTH:
format = "%Y-%m-01";
break;
case DAY:
format = "%Y-%m-%d";
break;
case HOUR:
format = "%Y-%m-%d %H:00:00";
break;
case MINUTE:
format = "%Y-%m-%d %H:%i:00";
break;
case SECOND:
format = "%Y-%m-%d %H:%i:%s";
break;
default:
throw new AssertionError("MYSQL does not support FLOOR for time unit: "
+ unit);
}
writer.print("DATE_FORMAT");
SqlWriter.Frame frame = writer.startList("(", ")");
call.operand(0).unparse(writer, 0, 0);
writer.sep(",", true);
writer.print("'" + format + "'");
writer.endList(frame);
}
@Override public void unparseSqlIntervalQualifier(SqlWriter writer,
SqlIntervalQualifier qualifier, RelDataTypeSystem typeSystem) {
// Unit Value | Expected Format
// --------------------+-------------------------------------------
// MICROSECOND | MICROSECONDS
// SECOND | SECONDS
// MINUTE | MINUTES
// HOUR | HOURS
// DAY | DAYS
// WEEK | WEEKS
// MONTH | MONTHS
// QUARTER | QUARTERS
// YEAR | YEARS
// MINUTE_SECOND | 'MINUTES:SECONDS'
// HOUR_MINUTE | 'HOURS:MINUTES'
// DAY_HOUR | 'DAYS HOURS'
// YEAR_MONTH | 'YEARS-MONTHS'
// MINUTE_MICROSECOND | 'MINUTES:SECONDS.MICROSECONDS'
// HOUR_MICROSECOND | 'HOURS:MINUTES:SECONDS.MICROSECONDS'
// SECOND_MICROSECOND | 'SECONDS.MICROSECONDS'
// DAY_MINUTE | 'DAYS HOURS:MINUTES'
// DAY_MICROSECOND | 'DAYS HOURS:MINUTES:SECONDS.MICROSECONDS'
// DAY_SECOND | 'DAYS HOURS:MINUTES:SECONDS'
// HOUR_SECOND | 'HOURS:MINUTES:SECONDS'
if (!qualifier.useDefaultFractionalSecondPrecision()) {
throw new AssertionError("Fractional second precision is not supported now ");
}
final String start = validate(qualifier.timeUnitRange.startUnit).name();
if (qualifier.timeUnitRange.startUnit == TimeUnit.SECOND
|| qualifier.timeUnitRange.endUnit == null) {
writer.keyword(start);
} else {
writer.keyword(start + "_" + qualifier.timeUnitRange.endUnit.name());
}
}
private TimeUnit validate(TimeUnit timeUnit) {
switch (timeUnit) {
case MICROSECOND:
case SECOND:
case MINUTE:
case HOUR:
case DAY:
case WEEK:
case MONTH:
case QUARTER:
case YEAR:
return timeUnit;
default:
throw new AssertionError(" Time unit " + timeUnit + "is not supported now.");
}
}
}
