org.voltdb.plannerv2.converter.ExpressionTypeConverter Maven / Gradle / Ivy
/* This file is part of VoltDB.
* Copyright (C) 2008-2020 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltdb.plannerv2.converter;
import com.google.common.collect.ImmutableMap;
import org.apache.calcite.sql.SqlKind;
import org.voltdb.types.ExpressionType;
/**
* Covert from Calcite aggregation function type to Volt aggregation function type.
*/
public class ExpressionTypeConverter {
private ExpressionTypeConverter() {}
private final static ImmutableMap calciteToVoltDBExpressionTypeMap =
ImmutableMap.builder()
.put(SqlKind.MIN.lowerName, ExpressionType.AGGREGATE_MIN)
.put(SqlKind.MAX.lowerName, ExpressionType.AGGREGATE_MAX)
.put(SqlKind.SUM.lowerName, ExpressionType.AGGREGATE_SUM)
.put(SqlKind.SUM0.lowerName, ExpressionType.AGGREGATE_SUM)
.put(SqlKind.AVG.lowerName, ExpressionType.AGGREGATE_AVG)
.put(SqlKind.COUNT.lowerName, ExpressionType.AGGREGATE_COUNT)
.build();
public static ExpressionType calciteTypeToVoltType(SqlKind sqlKind) {
ExpressionType exprType = calciteToVoltDBExpressionTypeMap.get(sqlKind.lowerName);
return exprType != null ? exprType : ExpressionType.INVALID;
}
}