RegexpReplaceOne.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.functions.scalar;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.exceptions.AnalysisException;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.AlwaysNullable;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.functions.PropagateNullLiteral;
import org.apache.doris.nereids.trees.expressions.literal.Literal;
import org.apache.doris.nereids.trees.expressions.shape.TernaryExpression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.DataType;
import org.apache.doris.nereids.types.StringType;
import org.apache.doris.nereids.types.VarcharType;

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

import java.util.List;

/**
 * ScalarFunction 'regexp_replace_one'. This class is generated by GenerateFunction.
 */
public class RegexpReplaceOne extends ScalarFunction
        implements TernaryExpression, ExplicitlyCastableSignature, AlwaysNullable, PropagateNullLiteral {

    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(VarcharType.SYSTEM_DEFAULT)
                    .args(VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT),
            FunctionSignature.ret(StringType.INSTANCE)
                    .args(StringType.INSTANCE, StringType.INSTANCE, StringType.INSTANCE),
            FunctionSignature.ret(VarcharType.SYSTEM_DEFAULT)
                    .args(VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT,
                            VarcharType.SYSTEM_DEFAULT),
            FunctionSignature.ret(StringType.INSTANCE)
                    .args(StringType.INSTANCE, StringType.INSTANCE, StringType.INSTANCE, StringType.INSTANCE)
    );

    /**
     * constructor with 3 arguments.
     */
    public RegexpReplaceOne(Expression arg0, Expression arg1, Expression arg2) {
        super("regexp_replace_one", arg0, arg1, arg2);
    }

    /**
     * constructor with 4 arguments.
     */
    public RegexpReplaceOne(Expression arg0, Expression arg1, Expression arg2, Expression arg3) {
        super("regexp_replace_one", arg0, arg1, arg2, arg3);
    }

    /**
     * withChildren.
     */
    @Override
    public RegexpReplaceOne withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 3 || children.size() == 4,
                "RegexpReplaceOne should have 3 or 4 children");
        if (children.size() == 3) {
            return new RegexpReplaceOne(children.get(0), children.get(1), children.get(2));
        } else {
            return new RegexpReplaceOne(children.get(0), children.get(1), children.get(2), children.get(3));
        }
    }

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        if (children().size() == 3) {
            return;
        }
        if (children().size() == 4) {
            Expression value = child(3);
            DataType type = value.getDataType();
            if (!type.isStringLikeType()) {
                throw new AnalysisException(
                        "The fourth param of regexp_replace_one must be a string type: " + this.toSql());
            }
            if (!(value instanceof Literal)) {
                throw new AnalysisException(
                        "The fourth param of regexp_replace_one must be a constant value: " + this.toSql());
            }
        }
    }

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

    @Override
    public List<FunctionSignature> getSignatures() {
        return SIGNATURES;
    }
}