spark-instrumented-optimizer/sql/core
aokolnychyi ee13f3e3dc [SPARK-21969][SQL] CommandUtils.updateTableStats should call refreshTable
## What changes were proposed in this pull request?

Tables in the catalog cache are not invalidated once their statistics are updated. As a consequence, existing sessions will use the cached information even though it is not valid anymore. Consider and an example below.

```
// step 1
spark.range(100).write.saveAsTable("tab1")
// step 2
spark.sql("analyze table tab1 compute statistics")
// step 3
spark.sql("explain cost select distinct * from tab1").show(false)
// step 4
spark.range(100).write.mode("append").saveAsTable("tab1")
// step 5
spark.sql("explain cost select distinct * from tab1").show(false)
```

After step 3, the table will be present in the catalog relation cache. Step 4 will correctly update the metadata inside the catalog but will NOT invalidate the cache.

By the way, ``spark.sql("analyze table tab1 compute statistics")`` between step 3 and step 4 would also solve the problem.

## How was this patch tested?

Current and additional unit tests.

Author: aokolnychyi <anton.okolnychyi@sap.com>

Closes #19252 from aokolnychyi/spark-21969.
2017-09-19 14:19:13 -07:00
..
benchmarks [SPARK-17335][SQL] Fix ArrayType and MapType CatalogString. 2016-09-03 19:02:20 +02:00
src [SPARK-21969][SQL] CommandUtils.updateTableStats should call refreshTable 2017-09-19 14:19:13 -07:00
pom.xml [SPARK-20978][SQL] Bump up Univocity version to 2.5.4 2017-09-05 23:21:43 +08:00