MVColumnOneChildPattern.java

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.analysis;

public class MVColumnOneChildPattern implements MVColumnPattern {

    private String functionName;

    public MVColumnOneChildPattern(String functionName) {
        this.functionName = functionName;
    }

    @Override
    public boolean match(Expr expr) {
        if (!(expr instanceof FunctionCallExpr)) {
            return false;
        }
        FunctionCallExpr functionCallExpr = (FunctionCallExpr) expr;
        if (functionCallExpr.isDistinct()) {
            return false;
        }
        String exprFnName = functionCallExpr.getFnName().getFunction();
        if (!exprFnName.equalsIgnoreCase(functionName)) {
            return false;
        }
        if (functionCallExpr.getChildren().size() != 1) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return functionName + "(column)";
    }
}