viirya commented on a change in pull request #25214: [SPARK-28461][SQL] Pad
Decimal numbers with trailing zeros to the scale of the column
URL: https://github.com/apache/spark/pull/25214#discussion_r349957892
##########
File path: docs/sql-migration-guide.md
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@@ -224,6 +224,32 @@ license: |
- Since Spark 3.0, when casting string value to integral types, including
tinyint, smallint, int and bigint type, the leading and trailing white
spaces(<= ACSII 32) will be trimmed before convert to integral values, e.g.
`cast(' 1 ' as int)` results `1`. In Spark version 2.4 and earlier, the result
will be `null`.
+ - Since Spark 3.0, we pad decimal numbers with trailing zeros to the scale
of the column for Hive result, for example:
+ <table class="table">
+ <tr>
+ <th>
+ <b>Query</b>
+ </th>
+ <th>
+ <b>Spark 2.4 or Prior or Hive</b>
Review comment:
why Hive here? isn't this default behavior of Hive? @wangyum
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