IsTrue.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.nereids.trees.expressions;

import org.apache.doris.nereids.exceptions.UnboundException;
import org.apache.doris.nereids.trees.expressions.functions.AlwaysNotNullable;
import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.BooleanType;
import org.apache.doris.nereids.types.DataType;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.Objects;

/**
 * expr is true predicate.
 */
public class IsTrue extends Expression implements UnaryExpression, AlwaysNotNullable {

    public IsTrue(Expression e) {
        super(ImmutableList.of(e));
    }

    private IsTrue(List<Expression> children) {
        super(children);
    }

    @Override
    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
        return visitor.visitIsTrue(this, context);
    }

    @Override
    public IsTrue withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 1);
        return new IsTrue(children);
    }

    @Override
    public String computeToSql() throws UnboundException {
        return child().toSql() + " IS TRUE";
    }

    @Override
    public String toString() {
        return child().toString() + " IS TRUE";
    }

    @Override
    public String toDigest() {
        return child().toDigest() + " IS TRUE";
    }

    @Override
    public boolean equals(Object o) {
        if (!super.equals(o)) {
            return false;
        }
        IsTrue other = (IsTrue) o;
        return Objects.equals(child(), other.child());
    }

    @Override
    public int computeHashCode() {
        return child().hashCode();
    }

    @Override
    public DataType getDataType() throws UnboundException {
        return BooleanType.INSTANCE;
    }
}