shahidki31 commented on a change in pull request #24715: [SPARK-25474][SQL]
Data source tables support fallback to HDFS for size estimation
URL: https://github.com/apache/spark/pull/24715#discussion_r315089409
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
##########
@@ -619,3 +619,34 @@ object DataSourceStrategy {
(nonconvertiblePredicates ++ unhandledPredicates, pushedFilters,
handledFilters)
}
}
+
+
+/**
+ * Defines default table statistics if table statistics are not available.
+ */
+class DetermineTableStats(session: SparkSession) extends Rule[LogicalPlan] {
+
+ private val conf = session.sessionState.conf
+
+ override def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ // For the data source table, we only recalculate the table statistics
Review comment:
Yeah, then there will not be any behavior change between this PR and #22502.
right?
Because, it it will check the table stats is empty or not at this line.
```
case logical @ LogicalRelation(_, _, Some(table), _)
if DDLUtils.isDatasourceTable(table) && table.stats.isEmpty &&
```
In #22502, checking table stats exists here,
https://github.com/apache/spark/blob/f999e00e9fc03889106a305eeec6d05b6a2c1de1/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/LogicalRelation.scala#L43-L45
So, the fallback behavior is same in both the PRs, by not considering the
relation stats and falling back to HDFS if the table size is empty?
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