com.hazelcast.jet.sql.impl.validate.types.HazelcastTypeSystem Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.validate.types;
import com.hazelcast.jet.sql.impl.validate.HazelcastSqlValidator;
import com.hazelcast.sql.impl.type.QueryDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeSystem;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeSystemImpl;
import com.hazelcast.org.apache.calcite.sql.type.BasicSqlType;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.BIGINT;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.DECIMAL;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.DOUBLE;
/**
* Custom Hazelcast type system.
*
* Overrides some properties of the default Calcite type system, like maximum
* numeric precision, and provides various type-related utilities for {@link
* HazelcastTypeCoercion} and {@link HazelcastSqlValidator}.
*/
public final class HazelcastTypeSystem extends RelDataTypeSystemImpl {
/**
* Shared Hazelcast type system instance.
*/
public static final RelDataTypeSystem INSTANCE = new HazelcastTypeSystem();
/**
* Defines maximum DECIMAL precision.
*/
public static final int MAX_DECIMAL_PRECISION = QueryDataType.MAX_DECIMAL_PRECISION;
/**
* Defines maximum DECIMAL scale.
*/
public static final int MAX_DECIMAL_SCALE = MAX_DECIMAL_PRECISION;
private HazelcastTypeSystem() {
// No-op
}
@Override
public int getMaxNumericPrecision() {
return MAX_DECIMAL_PRECISION;
}
@Override
public int getMaxNumericScale() {
return MAX_DECIMAL_SCALE;
}
@Override
public RelDataType deriveSumType(RelDataTypeFactory typeFactory, RelDataType argumentType) {
if (argumentType instanceof BasicSqlType) {
SqlTypeName type = deriveSumType(argumentType.getSqlTypeName());
if (type == BIGINT) {
// special-case for BIGINT - we use BIGINT(64) instead of the default BIGINT(63) because
// BIGINT + BIGINT can overflow.
return HazelcastIntegerType.create(Long.SIZE, argumentType.isNullable());
}
if (type.allowsPrec() && argumentType.getPrecision() != RelDataType.PRECISION_NOT_SPECIFIED) {
int precision = typeFactory.getTypeSystem().getMaxPrecision(type);
if (type.allowsScale()) {
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(type, precision, argumentType.getScale()),
argumentType.isNullable()
);
} else {
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(type, precision),
argumentType.isNullable()
);
}
} else {
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(type),
argumentType.isNullable()
);
}
}
return argumentType;
}
private static SqlTypeName deriveSumType(SqlTypeName type) {
switch (type) {
case TINYINT:
case SMALLINT:
case INTEGER:
return SqlTypeName.BIGINT;
case BIGINT:
case DECIMAL:
return SqlTypeName.DECIMAL;
case REAL:
case DOUBLE:
return SqlTypeName.DOUBLE;
default:
return type;
}
}
@Override
public RelDataType deriveAvgAggType(RelDataTypeFactory typeFactory, RelDataType argumentType) {
switch (argumentType.getSqlTypeName()) {
case TINYINT:
case SMALLINT:
case INTEGER:
case BIGINT:
case DECIMAL:
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(DECIMAL),
argumentType.isNullable()
);
case REAL:
case DOUBLE:
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(DOUBLE),
argumentType.isNullable()
);
default:
return argumentType;
}
}
}