com.hazelcast.org.apache.calcite.sql.fun.SqlTimestampAddFunction 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 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.fun;
import com.hazelcast.org.apache.calcite.avatica.util.TimeUnit;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.SqlFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlReturnTypeInference;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeFamily;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
/**
* The TIMESTAMPADD function, which adds an interval to a
* datetime (TIMESTAMP, TIME or DATE).
*
* The SQL syntax is
*
*
* TIMESTAMPADD(timestamp interval, quantity,
* datetime)
*
*
* The interval time unit can one of the following literals:
* - NANOSECOND (and synonym SQL_TSI_FRAC_SECOND)
*
- MICROSECOND (and synonyms SQL_TSI_MICROSECOND, FRAC_SECOND)
*
- SECOND (and synonym SQL_TSI_SECOND)
*
- MINUTE (and synonym SQL_TSI_MINUTE)
*
- HOUR (and synonym SQL_TSI_HOUR)
*
- DAY (and synonym SQL_TSI_DAY)
*
- WEEK (and synonym SQL_TSI_WEEK)
*
- MONTH (and synonym SQL_TSI_MONTH)
*
- QUARTER (and synonym SQL_TSI_QUARTER)
*
- YEAR (and synonym SQL_TSI_YEAR)
*
*
* Returns modified datetime.
*/
public class SqlTimestampAddFunction extends SqlFunction {
private static final int MILLISECOND_PRECISION = 3;
private static final int MICROSECOND_PRECISION = 6;
private static final SqlReturnTypeInference RETURN_TYPE_INFERENCE =
opBinding -> {
final RelDataTypeFactory typeFactory = opBinding.getTypeFactory();
return deduceType(typeFactory,
opBinding.getOperandLiteralValue(0, TimeUnit.class),
opBinding.getOperandType(1), opBinding.getOperandType(2));
};
public static RelDataType deduceType(RelDataTypeFactory typeFactory,
TimeUnit timeUnit, RelDataType operandType1, RelDataType operandType2) {
final RelDataType type;
switch (timeUnit) {
case HOUR:
case MINUTE:
case SECOND:
case MILLISECOND:
case MICROSECOND:
switch (timeUnit) {
case MILLISECOND:
type = typeFactory.createSqlType(SqlTypeName.TIMESTAMP,
MILLISECOND_PRECISION);
break;
case MICROSECOND:
type = typeFactory.createSqlType(SqlTypeName.TIMESTAMP,
MICROSECOND_PRECISION);
break;
default:
if (operandType2.getSqlTypeName() == SqlTypeName.TIME) {
type = typeFactory.createSqlType(SqlTypeName.TIME);
} else {
type = typeFactory.createSqlType(SqlTypeName.TIMESTAMP);
}
}
break;
default:
type = operandType2;
}
return typeFactory.createTypeWithNullability(type,
operandType1.isNullable()
|| operandType2.isNullable());
}
/** Creates a SqlTimestampAddFunction. */
SqlTimestampAddFunction() {
super("TIMESTAMPADD", SqlKind.TIMESTAMP_ADD, RETURN_TYPE_INFERENCE, null,
OperandTypes.family(SqlTypeFamily.ANY, SqlTypeFamily.INTEGER,
SqlTypeFamily.DATETIME),
SqlFunctionCategory.TIMEDATE);
}
}