yzeng1618 commented on code in PR #10145:
URL: https://github.com/apache/seatunnel/pull/10145#discussion_r2587076698
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seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/sql/zeta/functions/StringFunction.java:
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@@ -231,6 +231,9 @@ public static String left(List<Object> args) {
return null;
Review Comment:
Actually, whitespace is a valid string value, not null. LEFT(' ', 2) should
return ' ' (two spaces), following standard SQL behavior. Only when the input
is NULL should we return NULL.
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