tarun11Mavani commented on code in PR #18710:
URL: https://github.com/apache/pinot/pull/18710#discussion_r3386311551
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pinot-segment-local/src/main/java/org/apache/pinot/segment/local/utils/TableConfigUtils.java:
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@@ -1620,6 +1604,23 @@ private static void
validateIndexingConfigAndFieldConfigList(TableConfig tableCo
validateMultiColumnTextIndex(indexingConfig.getMultiColumnTextIndexConfig());
+ // OPEN_STRUCT materialized child columns use a reserved separator '$' in
their name. When any
Review Comment:
Yes, that's correct — an existing schema with `$` in a column name would
fail validation if you add an OPEN_STRUCT field.
This is intentional: `$` in column names is extremely rare in practice, and
the restriction only activates when you opt into OPEN_STRUCT. The error message
is explicit about what's wrong and why, so it shouldn't be a confusing failure.
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