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CastOperator.java
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CastOperator.java
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// Copyright 2021-present StarRocks, Inc. All rights reserved.
//
// Licensed 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
//
// https://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 com.starrocks.sql.optimizer.operator.scalar;
import com.google.common.collect.Lists;
import com.starrocks.catalog.ScalarType;
import com.starrocks.catalog.Type;
import java.util.Objects;
public class CastOperator extends CallOperator {
private final boolean isImplicit;
public CastOperator(Type returnType, ScalarOperator args) {
super("cast", returnType, Lists.newArrayList(args));
this.isImplicit = false;
}
public CastOperator(Type returnType, ScalarOperator args, boolean isImplicit) {
super("cast", returnType, Lists.newArrayList(args));
this.isImplicit = isImplicit;
}
public Type fromType() {
return getChild(0).getType();
}
public boolean isImplicit() {
return isImplicit;
}
@Override
public boolean isNullable() {
ScalarOperator fromOperator = getChild(0);
if (ScalarType.isImplicitlyCastable(fromOperator.getType(), getType(), true)) {
return fromOperator.isNullable();
}
return true;
}
@Override
public String toString() {
return "cast(" + getChild(0).toString() + " as " + getType().toSql() + ")";
}
@Override
public String debugString() {
return "cast(" + getChild(0).debugString() + " as " + getType().toSql() + ")";
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
if (!super.equals(o)) {
return false;
}
CastOperator that = (CastOperator) o;
return isImplicit == that.isImplicit && type.equals(that.type);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), isImplicit, type);
}
@Override
public <R, C> R accept(ScalarOperatorVisitor<R, C> visitor, C context) {
return visitor.visitCastOperator(this, context);
}
}