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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/05/15 23:10:37 UTC
[GitHub] [spark] wangyum commented on issue #24523: [SPARK-27631][SQL] Avoid
repeating calculate table statistics
wangyum commented on issue #24523: [SPARK-27631][SQL] Avoid repeating calculate table statistics
URL: https://github.com/apache/spark/pull/24523#issuecomment-492857080
Another special case. The data source table's statistics should be nonEmpty once `ANALYZE` it when using `HiveExternalCatalog`.
```scala
val tableName = "spark_27631"
withTable(tableName) {
sql(s"CREATE TABLE $tableName(c1 INT) USING PARQUET")
sql(s"INSERT INTO $tableName VALUES(1)")
assert(DDLUtils.isDatasourceTable(getCatalogTable(tableName)))
assert(getCatalogTable(tableName).stats.isEmpty)
sql(s"ANALYZE TABLE $tableName COMPUTE STATISTICS")
assert(getCatalogTable(tableName).stats.nonEmpty)
sql(s"INSERT INTO $tableName VALUES(1)")
// assert(getCatalogTable(tableName).stats.nonEmpty) // For HiveExternalCatalog
// assert(getCatalogTable(tableName).stats.isEmpty) // For InMemoryCatalog
}
```
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