add context flag "useAutoColumnSchemas" to use new auto types for MSQ segment generation#14175
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clintropolis merged 3 commits intoapache:masterfrom May 10, 2023
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cryptoe
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Apr 27, 2023
| return decodeIndexSpec(queryContext.get(CTX_INDEX_SPEC), objectMapper); | ||
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| public static boolean useAutoColumnSchemas(final QueryContext queryContext) |
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Please document the use of this externally undocumented feature in the class level docs. https://github.com/apache/druid/pull/14175/files#diff-cbcc2f2c9d571876786fe63eef35c2d82d64de0700334267c22f83f31d633af0L51
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Description
Adds new MSQ query context parameter
useAutoColumnSchemasas a sort of hacky backdoor to allow using the latest and greatest features added in #14014 and related PRs (#13803, etc). When set, all columns except for customCOMPLEXcolumn types will use the native 'auto' column indexer added in #14014 when generating segments. I call this a bit hacky because MSQ doesn't officially support the true array types besidesARRAY<STRING>, which is translated intoSTRINGunless the new context flag is set, but other array types can be still be ingested by specifyingCOMPLEX<json>as the input schema to use the complex passthrough.I did not document this at this time on purpose, this is mainly for allowing experimentation with the newer column features and MSQ.
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