Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18411#discussion_r124447131
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/OracleDialect.scala ---
@@ -68,5 +69,13 @@ private case object OracleDialect extends JdbcDialect {
case _ => None
}
+ override def beforeFetch(connection: Connection, properties: Map[String,
String]): Unit = {
+ // Set general date and timestamp format before query.
+ val stmt = connection.createStatement()
+ stmt.execute("alter session set NLS_DATE_FORMAT = 'YYYY-MM-DD'")
+ stmt.execute("alter session set NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD
HH24:MI:SS.FF'")
--- End diff --
To avoid this issue, we should change the way we generate the where clause.
That is why I proposed to make `compileValue` Dialect specific. It sounds like
there are two approaches to convert the timestamp string to Oracle-recognized
timestamp string in the where clause
- `INSERT INTO datetime VALUES (1, {d '1991-11-09'}, {ts '1996-01-01
01:23:45'}`
- call `to_timestamp_tz`
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