Hyukjin Kwon created SPARK-20938:
------------------------------------
Summary: explain() for datasources implementing CatalystScan does
not show pushed predicates correctly
Key: SPARK-20938
URL: https://issues.apache.org/jira/browse/SPARK-20938
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.0
Reporter: Hyukjin Kwon
Priority: Minor
Actual pushed-down catalyst predicate expressions look not being represented
correctly (but only sources filters) when we use a datasource implementing
{{CatalystScan}}. For example, the below case
```scala
df.filter("cast(a as string) == '1' and a < 3").explain()
```
prints the plan as below:
```
== Physical Plan ==
*Filter (cast(a#0L as string) = 1)
+- *Scan SimpleCatalystScan(0,10) [a#0L] PushedFilters: [*LessThan(a,3)],
ReadSchema: struct<a:bigint>
```
Actual predicates via `buildScan(requiredColumns: Seq[Attribute], filters:
Seq[Expression])` are as below:
```scala
println(filters.mkString("[", ", ", "]"))
```
```
[(cast(a#0L as string) = 1), (a#0L < 3)]
```
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