Xiangrui Meng created SPARK-13484:
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Summary: Filter outer joined result using a non-nullable column
Key: SPARK-13484
URL: https://issues.apache.org/jira/browse/SPARK-13484
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.0, 1.5.2, 2.0.0
Reporter: Xiangrui Meng
Technically speaking, this is not a bug. But
{code}
val a = sqlContext.range(10).select(col("id"), lit(0).as("count"))
val b = sqlContext.range(10).select((col("id") %
3).as("id")).groupBy("id").count()
a.join(b, a("id") === b("id"), "left_outer").filter(b("count").isNull).show()
{code}
returns nothing. This is because `b("count")` is not nullable and the filter
condition is always false by static analysis. However, it is common for users
to use `a(...)` and `b(...)` to filter the joined result.
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