SplitByRegexp.java

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// to you under the Apache License, Version 2.0 (the
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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.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.functions.PropagateNullable;
import org.apache.doris.nereids.trees.expressions.literal.IntegerLikeLiteral;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.ArrayType;
import org.apache.doris.nereids.types.IntegerType;
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 'split_by_regexp'. This class is generated by
 * GenerateFunction.
 */
public class SplitByRegexp extends ScalarFunction
        implements ExplicitlyCastableSignature, PropagateNullable {

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

    /**
     * constructor with 2 arguments.
     */
    public SplitByRegexp(Expression arg0, Expression arg1) {
        super("split_by_regexp", arg0, arg1);
    }

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

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

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        if (children().size() == 3) {
            if (!child(2).isConstant() || !(child(2) instanceof IntegerLikeLiteral)
                    || (((IntegerLikeLiteral) child(2)).getIntValue() < 0)) {
                throw new AnalysisException("the third parameter of "
                        + getName() + " function must be a positive constant: " + toSql());
            }
        }
    }

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

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