Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14971#discussion_r117158531
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
---
@@ -414,6 +415,50 @@ private[hive] class HiveClientImpl(
val properties = Option(h.getParameters).map(_.asScala.toMap).orNull
+ // Hive-generated Statistics are also recorded in ignoredProperties
+ val ignoredProperties = scala.collection.mutable.Map.empty[String,
String]
+ for (key <- HiveStatisticsProperties; value <- properties.get(key)) {
+ ignoredProperties += key -> value
+ }
+
+ val excludedTableProperties = HiveStatisticsProperties ++ Set(
+ // The property value of "comment" is moved to the dedicated field
"comment"
+ "comment",
+ // For EXTERNAL_TABLE, the table properties has a particular field
"EXTERNAL". This is added
+ // in the function toHiveTable.
+ "EXTERNAL"
+ )
+
+ val filteredProperties = properties.filterNot {
+ case (key, _) => excludedTableProperties.contains(key)
+ }
+ val comment = properties.get("comment")
+
+ val totalSize =
properties.get(StatsSetupConst.TOTAL_SIZE).map(BigInt(_))
+ val rawDataSize =
properties.get(StatsSetupConst.RAW_DATA_SIZE).map(BigInt(_))
+ def rowCount =
properties.get(StatsSetupConst.ROW_COUNT).map(BigInt(_)) match {
+ case Some(c) if c >= 0 => Some(c)
+ case _ => None
+ }
+ // TODO: check if this estimate is valid for tables after partition
pruning.
+ // NOTE: getting `totalSize` directly from params is kind of hacky,
but this should be
+ // relatively cheap if parameters for the table are populated into
the metastore.
+ // Currently, only totalSize, rawDataSize, and row_count are used to
build the field `stats`
+ // TODO: stats should include all the other two fields (`numFiles`
and `numPartitions`).
+ // (see StatsSetupConst in Hive)
+ val stats =
+ // When table is external, `totalSize` is always zero, which will
influence join strategy
+ // so when `totalSize` is zero, use `rawDataSize` instead. When
`rawDataSize` is also zero,
+ // return None. Later, we will use the other ways to estimate the
statistics.
+ if (totalSize.isDefined && totalSize.get > 0L) {
--- End diff --
the indention is wrong
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