Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/20705#discussion_r172024213 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala --- @@ -2150,7 +2150,8 @@ class SQLQuerySuite extends QueryTest with SharedSQLContext { test("data source table created in InMemoryCatalog should be able to read/write") { withTable("tbl") { - sql("CREATE TABLE tbl(i INT, j STRING) USING parquet") + val provider = spark.sessionState.conf.defaultDataSourceName --- End diff -- So far, the purpose of this PR is **setting once in `SQLConf.scala`** to order to test a new data source to find out the limitation instead of **touching every data suite**. BTW, `spark.sql.sources.default=parquet` doesn't help this existing code because the SQL has a fixed string `USING parquet`.
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