fe/fe-core/src/main/java/org/apache/doris/nereids/parser/AbstractFnCallTransformer.java

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package org.apache.doris.nereids.parser;

import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.Function;

import java.util.List;

/**
 * Abstract function transformer, dialect function transformer should extend this.
 */
public abstract class AbstractFnCallTransformer {

    /**
     * Check source function signature is the same between function from SQL and
     * definition in function call transformer.
     * Check the targetArgs param matches the definition in function call transformer.
     */
    protected abstract boolean check(String sourceFnName,
                                     List<Expression> sourceFnTransformedArguments,
                                     ParserContext context);

    /**
     * After check, do transform for function mapping.
     */
    protected abstract Function transform(String sourceFnName,
                                          List<Expression> sourceFnTransformedArguments,
                                          ParserContext context);
}