huaxingao commented on a change in pull request #34311:
URL: https://github.com/apache/spark/pull/34311#discussion_r732874959
##########
File path:
external/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/v2/PostgresIntegrationSuite.scala
##########
@@ -49,6 +49,8 @@ class PostgresIntegrationSuite extends
DockerJDBCIntegrationSuite with V2JDBCTes
override def sparkConf: SparkConf = super.sparkConf
.set("spark.sql.catalog.postgresql", classOf[JDBCTableCatalog].getName)
.set("spark.sql.catalog.postgresql.url", db.getJdbcUrl(dockerIp,
externalPort))
+ .set("spark.sql.catalog.postgresql.pushDownTableSample", "true")
Review comment:
Yes. It requires the underlying support. `Sample` is not part of the
ANSI SQL standard so not all data sources support it.
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