[GitHub] [incubator-druid] clintropolis commented on a change in pull request #8894: document SQL compatible null handling mode

[GitBox <gi...@apache.org>]

clintropolis commented on a change in pull request #8894: document SQL compatible null handling mode
URL: https://github.com/apache/incubator-druid/pull/8894#discussion_r348299495
 
 

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 File path: docs/configuration/index.md
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 @@ -627,6 +627,15 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 |--------|-----------|-------|
 |`druid.indexing.doubleStorage`|Set to "float" to use 32-bit double representation for double columns.|double|
 
+### SQL compatible null handling
+Also prior to version 0.13.0, Druid string columns treated `''` and `null` values as interchangeable, and numeric columns were unable to represent `null` values, coercing `null` to `0`. Druid 0.13.0 introduced an at the time undocumented mode which enabled SQL compatible null handling, allowing string columns to distinguish empty strings from nulls, and numeric columns to contain null rows.
 
 Review comment:
   done

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