wangyum commented on a change in pull request #24715: [SPARK-25474][SQL][DOCS]
Update the docs for spark.sql.statistics.fallBackToHdfs
URL: https://github.com/apache/spark/pull/24715#discussion_r317383027
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -1216,8 +1216,12 @@ object SQLConf {
.createWithDefault(true)
val ENABLE_FALL_BACK_TO_HDFS_FOR_STATS =
buildConf("spark.sql.statistics.fallBackToHdfs")
- .doc("If the table statistics are not available from table metadata enable
fall back to hdfs." +
- " This is useful in determining if a table is small enough to use auto
broadcast joins.")
+ .doc("This flag is effective only if it is Hive table. When true, it will
fall back to HDFS " +
+ "if the table statistics are not available from table metadata. This is
useful in " +
+ "determining if a table is small enough to use auto broadcast joins. " +
+ "For non-partitioned data source table, it will be automatically
recalculated if table " +
+ "statistics are not available. For partitioned data source table, It is
" +
+ s"'${DEFAULT_SIZE_IN_BYTES.key}' if table statistics are not available.")
.booleanConf
Review comment:
@shahidki31 Yes. Running the `SET -v` command will show the entire list of
the SQL configuration:
http://spark.apache.org/docs/latest/configuration.html#spark-sql
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