DigitalMaskingConvert.java

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package org.apache.doris.nereids.rules.expression.rules;

import org.apache.doris.nereids.rules.expression.ExpressionPatternMatcher;
import org.apache.doris.nereids.rules.expression.ExpressionPatternRuleFactory;
import org.apache.doris.nereids.rules.expression.ExpressionRuleType;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.scalar.Concat;
import org.apache.doris.nereids.trees.expressions.functions.scalar.DigitalMasking;
import org.apache.doris.nereids.trees.expressions.functions.scalar.Left;
import org.apache.doris.nereids.trees.expressions.functions.scalar.Right;
import org.apache.doris.nereids.trees.expressions.literal.Literal;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * Convert DigitalMasking to Concat
 */
public class DigitalMaskingConvert implements ExpressionPatternRuleFactory {
    public static DigitalMaskingConvert INSTANCE = new DigitalMaskingConvert();

    @Override
    public List<ExpressionPatternMatcher<? extends Expression>> buildRules() {
        return ImmutableList.of(
                matchesType(DigitalMasking.class).then(digitalMasking ->
                    new Concat(
                            new Left(digitalMasking.child(), Literal.of(3)),
                            Literal.of("****"),
                            new Right(digitalMasking.child(), Literal.of(4))))
                    .toRule(ExpressionRuleType.DIGITAL_MASKING_CONVERT)
        );
    }
}