private String compareFieldWithLiteral(RexNode left, RexNode right, List<String> fieldNames) {
if (left.isA(SqlKind.CAST)) {
left = ((RexCall) left).getOperands().get(0);
}
if (left.isA(SqlKind.INPUT_REF) && right.isA(SqlKind.LITERAL)) {
final RexInputRef left1 = (RexInputRef) left;
String name = fieldNames.get(left1.getIndex());
return name;
} else {
return null;
}
}
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