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This module connects Table/SQL API and runtime. It is responsible
for translating and optimizing a table program into a Flink pipeline.
The module can access all resources that are required during
pre-flight and runtime phase for planning.
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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 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.calcite.sql2rel;
/*
* THIS FILE HAS BEEN COPIED FROM THE APACHE CALCITE PROJECT.
* We need support extended TUMBLE_ROWTIME and so on in FlinkSqlOperatorTable.
*/
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.sql.SqlFunction;
import org.apache.calcite.sql.fun.SqlStdOperatorTable;
/**
* Converts an expression for a group window function (e.g. TUMBLE) into an expression for an
* auxiliary group function (e.g. TUMBLE_START).
*
* @see SqlStdOperatorTable#TUMBLE
*/
public interface AuxiliaryConverter {
/**
* Converts an expression.
*
* @param rexBuilder Rex builder
* @param groupCall Call to the group function, e.g. "TUMBLE($2, 36000)"
* @param e Expression holding result of the group function, e.g. "$0"
* @return Expression for auxiliary function, e.g. "$0 + 36000" converts the result of TUMBLE to
* the result of TUMBLE_END
*/
RexNode convert(RexBuilder rexBuilder, RexNode groupCall, RexNode e);
/** Simple implementation of {@link AuxiliaryConverter}. */
class Impl implements AuxiliaryConverter {
private final SqlFunction f;
public Impl(SqlFunction f) {
this.f = f;
}
public RexNode convert(RexBuilder rexBuilder, RexNode groupCall, RexNode e) {
return rexBuilder.makeCall(this.f, e);
// FLINK QUICK FIX
// we do not use this logic right now
// switch (f.getKind()) {
// case TUMBLE_START:
// case HOP_START:
// case SESSION_START:
// case SESSION_END: // TODO: ?
// return e;
// case TUMBLE_END:
// return rexBuilder.makeCall(
// SqlStdOperatorTable.PLUS, e,
// ((RexCall) groupCall).operands.get(1));
// case HOP_END:
// return rexBuilder.makeCall(
// SqlStdOperatorTable.PLUS, e,
// ((RexCall) groupCall).operands.get(2));
// default:
// throw new AssertionError("unknown: " + f);
// }
}
}
}
// End AuxiliaryConverter.java
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