dilipbiswal opened a new pull request #25726: [SPARK-28773] Handling of NULL data in Spark SQL URL: https://github.com/apache/spark/pull/25726 ### What changes were proposed in this pull request? Document ```NULL``` semantics in SQL Reference Guide. ### Why are the changes needed? Currently Spark lacks documentation on how `NULL` data is handled in various expressions and operators. This is aimed at addressing this issue. ### Does this PR introduce any user-facing change? Yes. ### How was this patch tested? Tested using jykyll build --serve
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