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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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 org.apache.flink.table.planner.functions.sql;
import org.apache.calcite.sql.SqlFunction;
import org.apache.calcite.sql.SqlFunctionCategory;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlOperatorBinding;
import org.apache.calcite.sql.SqlSyntax;
import org.apache.calcite.sql.type.InferTypes;
import org.apache.calcite.sql.type.OperandTypes;
import org.apache.calcite.sql.type.ReturnTypes;
import org.apache.calcite.sql.type.SqlTypeFamily;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.sql.type.SqlTypeTransforms;
import org.apache.calcite.sql.validate.SqlMonotonicity;
/**
* Function that materializes a processing time attribute. After materialization the result can be
* used in regular arithmetical calculations.
*/
public class ProctimeMaterializeSqlFunction extends SqlFunction {
public ProctimeMaterializeSqlFunction() {
super(
"PROCTIME_MATERIALIZE",
SqlKind.OTHER_FUNCTION,
ReturnTypes.cascade(
ReturnTypes.explicit(SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE, 3),
SqlTypeTransforms.TO_NULLABLE),
InferTypes.RETURN_TYPE,
OperandTypes.family(SqlTypeFamily.TIMESTAMP),
SqlFunctionCategory.SYSTEM);
}
@Override
public SqlSyntax getSyntax() {
return SqlSyntax.FUNCTION;
}
@Override
public SqlMonotonicity getMonotonicity(SqlOperatorBinding call) {
return SqlMonotonicity.INCREASING;
}
@Override
public boolean isDeterministic() {
return false;
}
}