[
https://issues.apache.org/jira/browse/FLINK-32261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hanyu Zheng updated FLINK-32261:
--------------------------------
Description:
Description:
The current implementation of the {{map_union}} method in the Flink library
does not provide a way to combine two dictionaries into a single dictionary.
This enhancement aims to add this functionality, allowing users to merge
dictionaries efficiently.
Syntax:
{code:java}
map_union[map1: map, map2: map] -> map{code}
Arguments:
* map1:The first map to be merged.
* map2:The second map to be merged.
Returns: A new map that contains the combined key-value pairs from {{map1}} and
map{{{}2{}}}. If there are any overlapping keys, the value from {{map2}} will
overwrite the value from {{{}map1{}}}.
Examples:
# Merging maps with unique keys:
{code:java}
map1 = ['a': 1, 'b': 2] map2 = ['c': 3, 'd': 4] result = map_union(map1, map2)
Output: ['a': 1, 'b': 2, 'c': 3, 'd': 4]{code}
# Merging maps with overlapping keys:
{code:java}
map1 = ['a': 1, 'b': 2] dict2 = ['b': 3, 'c': 4] result = map_union[dict1,
dict2] Output: ['a': 1, 'b': 3, 'c': 4]{code}
See also:
prestodb: [https://prestodb.io/docs/current/functions/aggregate.html]
was:
Description:
The current implementation of the {{map_union}} method in the Flink library
does not provide a way to combine two dictionaries into a single dictionary.
This enhancement aims to add this functionality, allowing users to merge
dictionaries efficiently.
Syntax:
{code:java}
map_union[map1: map, map2: map] -> map{code}
Arguments:
* map1:The first map to be merged.
* map2:The second map to be merged.
Returns: A new map that contains the combined key-value pairs from {{map1}} and
map{{{}2{}}}. If there are any overlapping keys, the value from {{map2}} will
overwrite the value from {{{}map1{}}}.
Examples:
# Merging maps with unique keys:
{{}}
{code:java}
map1 = ['a': 1, 'b': 2] map2 = ['c': 3, 'd': 4] result = map_union(map1, map2)
Output: ['a': 1, 'b': 2, 'c': 3, 'd': 4]{code}
{{}} # Merging maps with overlapping keys:
{code:java}
map1 = ['a': 1, 'b': 2] dict2 = ['b': 3, 'c': 4] result = map_union[dict1,
dict2] Output: ['a': 1, 'b': 3, 'c': 4]{code}
See also:
prestodb: [https://prestodb.io/docs/current/functions/aggregate.html]
> Add MAP_UNION support in SQL & Table API
> ----------------------------------------
>
> Key: FLINK-32261
> URL: https://issues.apache.org/jira/browse/FLINK-32261
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Affects Versions: 1.18.0
> Reporter: Bonnie Varghese
> Assignee: Hanyu Zheng
> Priority: Major
> Fix For: 1.18.0
>
>
> Description:
> The current implementation of the {{map_union}} method in the Flink library
> does not provide a way to combine two dictionaries into a single dictionary.
> This enhancement aims to add this functionality, allowing users to merge
> dictionaries efficiently.
> Syntax:
>
> {code:java}
> map_union[map1: map, map2: map] -> map{code}
> Arguments:
> * map1:The first map to be merged.
> * map2:The second map to be merged.
> Returns: A new map that contains the combined key-value pairs from {{map1}}
> and map{{{}2{}}}. If there are any overlapping keys, the value from {{map2}}
> will overwrite the value from {{{}map1{}}}.
> Examples:
> # Merging maps with unique keys:
>
> {code:java}
> map1 = ['a': 1, 'b': 2] map2 = ['c': 3, 'd': 4] result = map_union(map1,
> map2) Output: ['a': 1, 'b': 2, 'c': 3, 'd': 4]{code}
> # Merging maps with overlapping keys:
>
>
> {code:java}
> map1 = ['a': 1, 'b': 2] dict2 = ['b': 3, 'c': 4] result = map_union[dict1,
> dict2] Output: ['a': 1, 'b': 3, 'c': 4]{code}
> See also:
> prestodb: [https://prestodb.io/docs/current/functions/aggregate.html]
>
>
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