MaxGekk commented on a change in pull request #26563: [SPARK-29758][SQL][2.4]
Fix truncation of requested string fields in `json_tuple`
URL: https://github.com/apache/spark/pull/26563#discussion_r347226053
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -1576,6 +1576,16 @@ object SQLConf {
"turning the flag on provides a way for these sources to see these
partitionBy columns.")
.booleanConf
.createWithDefault(false)
+
+ val OPTIMIZE_STRING_COPY_IN_JSON_TUPLE =
+ buildConf("spark.sql.optimizeStringCopyInJsonTuple.enabled")
Review comment:
The flag turns on/off an optimization which may produce wrong results for
large fields. For small fields, the optimization can work as tests in
`JsonFunctionsSuite` show. Enabling the optimization is up to users.
How would you name this flag?
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