[SPARK-21540] add spark.sql.functions.map_keys and spark.sql.functions.map_values

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.2.0
• Component/s: SQL
• Assignee: Unassigned
• Reporter: yu peng
• Created: 26/Jul/17 16:33
• Updated: 12/Dec/22 18:11
• Resolved: 27/Jul/17 00:29

Description

for dataframe/sql we support MapType, but unlike ArrayType, we can explode to unpack from it.
getItems is just not powerful enough for manipulate MapTypes

df.select(map_keys('$map')) and df.select(map_values('$map')) would be really useful

Issue Links

• duplicates: SPARK-19975 Add map_keys and map_values functions to Python