PetarVasiljevic-DB commented on code in PR #48625:
URL: https://github.com/apache/spark/pull/48625#discussion_r1815192500
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/PostgresDialect.scala:
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@@ -382,18 +382,21 @@ private case class PostgresDialect()
case Types.ARRAY =>
val tableName = rsmd.getTableName(columnIdx)
val columnName = rsmd.getColumnName(columnIdx)
- val query =
+ val query = if (conf.postgresProperReadingOfArrayDimensionality) {
+ s"SELECT array_ndims($columnName)) FROM $tableName LIMIT 1"
+ } else {
s"""
|SELECT pg_attribute.attndims
|FROM pg_attribute
Review Comment:
yes. The info about dimensionality is lost when table is created with CTAS
command. Some threads that discuss this:
https://www.postgresql.org/message-id/20150707072942.1186.98151%40wrigleys.postgresql.org,
https://postgrespro.com/list/thread-id/2304332. I have verified locally too.
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