org.apache.hadoop.hive.ql.optimizer.calcite.HiveTypeSystemImpl Maven / Gradle / Ivy
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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.
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package org.apache.hadoop.hive.ql.optimizer.calcite;
import org.apache.calcite.rel.type.RelDataTypeSystemImpl;
import org.apache.calcite.sql.type.SqlTypeName;
public class HiveTypeSystemImpl extends RelDataTypeSystemImpl {
// TODO: This should come from type system; Currently there is no definition
// in type system for this.
private static final int MAX_DECIMAL_PRECISION = 38;
private static final int MAX_DECIMAL_SCALE = 38;
private static final int DEFAULT_DECIMAL_PRECISION = 10;
private static final int MAX_VARCHAR_PRECISION = 65535;
private static final int MAX_CHAR_PRECISION = 255;
private static final int MAX_BINARY_PRECISION = Integer.MAX_VALUE;
private static final int MAX_TIMESTAMP_PRECISION = 9;
@Override
public int getMaxScale(SqlTypeName typeName) {
switch (typeName) {
case DECIMAL:
return getMaxNumericScale();
case INTERVAL_DAY_TIME:
case INTERVAL_YEAR_MONTH:
return SqlTypeName.MAX_INTERVAL_FRACTIONAL_SECOND_PRECISION;
default:
return -1;
}
}
@Override
public int getDefaultPrecision(SqlTypeName typeName) {
switch (typeName) {
// Hive will always require user to specify exact sizes for char, varchar;
// Binary doesn't need any sizes; Decimal has the default of 10.
case CHAR:
case VARCHAR:
case BINARY:
case VARBINARY:
case TIME:
case TIMESTAMP:
return getMaxPrecision(typeName);
case DECIMAL:
return DEFAULT_DECIMAL_PRECISION;
case INTERVAL_DAY_TIME:
case INTERVAL_YEAR_MONTH:
return SqlTypeName.DEFAULT_INTERVAL_START_PRECISION;
default:
return -1;
}
}
@Override
public int getMaxPrecision(SqlTypeName typeName) {
switch (typeName) {
case DECIMAL:
return getMaxNumericPrecision();
case VARCHAR:
return MAX_VARCHAR_PRECISION;
case CHAR:
return MAX_CHAR_PRECISION;
case VARBINARY:
case BINARY:
return MAX_BINARY_PRECISION;
case TIME:
case TIMESTAMP:
return MAX_TIMESTAMP_PRECISION;
case INTERVAL_DAY_TIME:
case INTERVAL_YEAR_MONTH:
return SqlTypeName.MAX_INTERVAL_START_PRECISION;
default:
return -1;
}
}
@Override
public int getMaxNumericScale() {
return MAX_DECIMAL_SCALE;
}
@Override
public int getMaxNumericPrecision() {
return MAX_DECIMAL_PRECISION;
}
}