Dongjoon Hyun created SPARK-25824:
-------------------------------------
Summary: Remove duplicated map entries in `showString`
Key: SPARK-25824
URL: https://issues.apache.org/jira/browse/SPARK-25824
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Dongjoon Hyun
`showString` doesn't eliminate the duplication. So, it looks different from the
result of `collect` and select from saved rows.
*Spark 2.2.2*
{code}
spark-sql> select map(1,2,1,3);
{1:3}
scala> sql("SELECT map(1,2,1,3)").collect
res0: Array[org.apache.spark.sql.Row] = Array([Map(1 -> 3)])
scala> sql("SELECT map(1,2,1,3)").show
+---------------+
|map(1, 2, 1, 3)|
+---------------+
| Map(1 -> 3)|
+---------------+
{code}
*Spark 2.3.0 ~ 2.4.0-rc4*
{code}
spark-sql> select map(1,2,1,3);
{1:3}
scala> sql("SELECT map(1,2,1,3)").collect
res1: Array[org.apache.spark.sql.Row] = Array([Map(1 -> 3)])
scala> sql("CREATE TABLE m AS SELECT map(1,2,1,3) a")
scala> sql("SELECT * FROM m").show
+--------+
| a|
+--------+
|[1 -> 3]|
+--------+
scala> sql("SELECT map(1,2,1,3)").show
+----------------+
| map(1, 2, 1, 3)|
+----------------+
|[1 -> 2, 1 -> 3]|
+----------------+
{code}
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