[refactor](nereids) print "ifnull" instead of "nvl" in explain #23979
'ifnull' is used more general.
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@ -82,7 +82,7 @@ public class Nvl extends ScalarFunction
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* constructor with 2 arguments.
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*/
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public Nvl(Expression arg0, Expression arg1) {
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super("nvl", arg0, arg1);
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super("ifnull", arg0, arg1);
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}
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/**
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