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https://issues.apache.org/jira/browse/SPARK-30781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mateusz User updated SPARK-30781:
---------------------------------
Description:
Currently there is only MapType in pyspark API, which does not keep order of
key-value map.
*SortedMapType* would fill this gap: a map with sorted key-value pairs (like
TreeMap in Java).
For example:
*SortedMapType* would be very useful when user wants to persist row from
DataFrame into Mongo-db.
row which consist a column with values of an ordered map type:
col : [1 -> 22, 2 -> 16, 3 -> 25]
will be persisted as following json:
{ "1": 22, "2": 16, "3": 25 }
instead of MapType which currently results in:
{ "2": 16, "1": 22, "3": 25 }
was:
Currently there is only MapType in pyspark API, which does not keep order of
key-value map.
*SortedMapType* would fill this gap: a map with sorted key-value pairs (like
TreeMap in Java).
For example:
*SortedMapType* would be very useful when user wants to persist row from
DataFrame into Mongo-db.
row which consist a column with values of an ordered map type:
col : [1 -> 22, 2 -> 16, 3 -> 25]
will be persisted as following json:
{
"1": 22,
"2": 16,
"3": 25
}
instead of MapType which results in currently:
{
"2": 16,
"1": 22,
"3": 25
}
> Missing SortedMap type in pyspark
> ---------------------------------
>
> Key: SPARK-30781
> URL: https://issues.apache.org/jira/browse/SPARK-30781
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 2.4.5
> Reporter: Mateusz User
> Priority: Major
> Labels: features
>
> Currently there is only MapType in pyspark API, which does not keep order of
> key-value map.
>
> *SortedMapType* would fill this gap: a map with sorted key-value pairs (like
> TreeMap in Java).
>
> For example:
> *SortedMapType* would be very useful when user wants to persist row from
> DataFrame into Mongo-db.
> row which consist a column with values of an ordered map type:
> col : [1 -> 22, 2 -> 16, 3 -> 25]
> will be persisted as following json:
> { "1": 22, "2": 16, "3": 25 }
>
> instead of MapType which currently results in:
> { "2": 16, "1": 22, "3": 25 }
>
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