yaooqinn commented on code in PR #50591:
URL: https://github.com/apache/spark/pull/50591#discussion_r2045880283
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala:
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@@ -314,6 +314,7 @@ object JdbcUtils extends Logging with SQLConfHelper {
metadata.putBoolean("isSigned", isSigned)
metadata.putBoolean("isTimestampNTZ", isTimestampNTZ)
metadata.putLong("scale", fieldScale)
+ metadata.putString("externalEngineTypeName", typeName)
Review Comment:
There could be a type conversion when a JDBC client gets the
ResultSetMetaData from DB systems. It's not always the DB-engine type. Names
like `jdbcType`/`jdbcClientType` might be more acurate
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