dongjoon-hyun commented on code in PR #43781:
URL: https://github.com/apache/spark/pull/43781#discussion_r1393703751
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -4541,6 +4541,15 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_RETAIN_FRACTION_DIGITS_FIRST =
+ buildConf("spark.sql.legacy.decimal.retainFractionDigitsOnTruncate")
+ .internal()
+ .doc("When set to true, we will try to retain the fraction digits first
rather than " +
+ "integral digits as prior Spark 4.0, when getting a least common type
between decimal " +
+ "types, and the result decimal precision exceeds the max precision.")
Review Comment:
Please add version, @cloud-fan . IIUC, this targets only Apache Spark 4.0.0?
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