Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17758#discussion_r121878933
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
---
@@ -741,14 +742,7 @@ object JdbcUtils extends Logging {
val nameEquality = df.sparkSession.sessionState.conf.resolver
// checks duplicate columns in the user specified column types.
- userSchema.fieldNames.foreach { col =>
- val duplicatesCols = userSchema.fieldNames.filter(nameEquality(_,
col))
- if (duplicatesCols.size >= 2) {
- throw new AnalysisException(
- "Found duplicate column(s) in createTableColumnTypes option
value: " +
- duplicatesCols.mkString(", "))
- }
- }
+ SchemaUtils.checkSchemaColumnNameDuplication(userSchema,
"createTableColumnTypes option value")
--- End diff --
In this JDBC case, we currently ignore case-sensitivity. IMHO we might need
to a JDBC data source option for case-sensitivity?
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