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[MINOR][SQL] Improve the comments about null tracking for UnsafeRow #37340

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[MINOR][SQL] Improve the comments about null tracking for UnsafeRow #37340

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[MINOR][SQL] Improve the comments about null tracking for UnsafeRow
beliefer Jul 29, 2022
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beliefer Jul 29, 2022
77a04ee
Update sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expre…
beliefer Aug 2, 2022
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beliefer Aug 2, 2022
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Update sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expre…
beliefer Aug 8, 2022
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beliefer Aug 8, 2022
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5 changes: 2 additions & 3 deletions sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java
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Expand Up @@ -46,10 +46,9 @@
/**
* An Unsafe implementation of Row which is backed by raw memory instead of Java objects.
*
* Each tuple has three parts: [null bit set] [values] [variable length portion]
* Each tuple has three parts: [null-tracking bit set] [values] [variable length portion]
*
* The bit set is used for null tracking and is aligned to 8-byte word boundaries. It stores
* one bit per field.
* The null-tracking bit set is aligned to 8-byte word boundaries. It stores one bit per field.
*
* In the `values` region, we store one 8-byte word per field. For fields that hold fixed-length
* primitive types, such as long, double, or int, we store the value directly in the word. For
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