jitendrakr88 commented on code in PR #15498:
URL: https://github.com/apache/pinot/pull/15498#discussion_r2047578237
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pinot-common/src/main/java/org/apache/pinot/sql/parsers/ParserUtils.java:
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@@ -39,6 +39,49 @@ public static void validateFunction(String canonicalName,
List<Expression> opera
}
}
+ /**
+ * Sanitize the sql string for parsing by normalizing whitespace which can
+ * cause performance issues with regex based parsing.
+ * This method replaces multiple consecutive whitespace characters with a
single space.
+ *
+ * @param sql The raw SQL string to sanitize. May be null.
+ * @return A sanitized SQL string with normalized whitespace and no trailing
spaces,
+ * or {@code null} if the input was {@code null}.
+ */
+ public static String sanitizeSqlForParsing(String sql) {
+
+ // 1. Remove excessive whitespace
+
+ int length = sql.length();
+ StringBuilder builder = new StringBuilder(length);
+ boolean inWhitespaceBlock = false;
+
+ for (int charIndex = 0; charIndex < length; charIndex++) {
Review Comment:
@Jackie-Jiang I feel there might be many edge cases that would eventually
lead us into complex parsing logic.
Example: (traversing backwards is likely to have no effect)
```
"SELECT * FROM t " + " ".repeat(20000) + " /* comment */ ";
```
Given this, I think the earlier approach of parsing character by character
might be more robust. It's also battle-tested with heavy production traffic and
has been running reliably within Uber for a while.
Let me know if that makes sense—I'm happy to revert to the original
implementation, and you can take your time to review it at your convenience.
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