com.hazelcast.org.apache.calcite.sql.fun.SqlDatetimeSubtractionOperator 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.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
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.validate.SqlMonotonicity;
/**
* A special operator for the subtraction of two DATETIMEs. The format of
* DATETIME subtraction is:
*
* "(" <datetime> "-" <datetime> ")"
* <interval qualifier>
*
* This operator is special since it needs to hold the
* additional interval qualifier specification, when in {@link SqlCall} form.
* In {@link com.hazelcast.org.apache.calcite.rex.RexNode} form, it has only two parameters,
* and the return type describes the desired type of interval.
*/
public class SqlDatetimeSubtractionOperator extends SqlSpecialOperator {
//~ Constructors -----------------------------------------------------------
public SqlDatetimeSubtractionOperator() {
super(
"-",
SqlKind.MINUS,
40,
true,
ReturnTypes.ARG2_NULLABLE,
InferTypes.FIRST_KNOWN, OperandTypes.MINUS_DATE_OPERATOR);
}
//~ Methods ----------------------------------------------------------------
public void unparse(
SqlWriter writer,
SqlCall call,
int leftPrec,
int rightPrec) {
writer.getDialect().unparseSqlDatetimeArithmetic(
writer, call, SqlKind.MINUS, leftPrec, rightPrec);
}
@Override public SqlMonotonicity getMonotonicity(SqlOperatorBinding call) {
return SqlStdOperatorTable.MINUS.getMonotonicity(call);
}
}