[jira] [Created] (SPARK-20938) explain() for datasources implementing CatalystScan does not show pushed predicates correctly

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

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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