[jira] [Updated] (CALCITE-5706) Add class PairList

["Julian Hyde (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-5706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-5706:
---------------------------------
    Description: 
Add a {{class PairList}} which is an implementation of {{List<Map.Entry<K, V>}} backed by a single list. Each entry to the {{PairList}} corresponds to two entries in the backing list, but we save ourselves the effort of creating {{Map.Entry}} wrappers.

A {{PairList}} can be used to build two lists in parallel (e.g. a list of field types and field names that will be converted to a struct type); it can also be used to build maps.

It has a {{forEach(BiConsumer<K, V>)}} method to allow the list to be deconstructed without creating intermediate entries.

Potentially also {{toImmutableMap}} and {{toHashMap}} methods.

  was:
Add a {{class PairList}} which an implementation of {{List<Map.Entry<K, V>}} backed by a single list. It can be used to build two lists in parallel (e.g. a list of field types and field names that will be converted to a struct type); it can also be used to build maps.

It has a {{forEach(BiConsumer<K, V>)}} method to allow the list to be deconstructed without creating intermediate entries.

Potentially also {{toImmutableMap}} and {{toHashMap}} methods.


> Add class PairList
> ------------------
>
>                 Key: CALCITE-5706
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5706
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>            Priority: Major
>
> Add a {{class PairList}} which is an implementation of {{List<Map.Entry<K, V>}} backed by a single list. Each entry to the {{PairList}} corresponds to two entries in the backing list, but we save ourselves the effort of creating {{Map.Entry}} wrappers.
> A {{PairList}} can be used to build two lists in parallel (e.g. a list of field types and field names that will be converted to a struct type); it can also be used to build maps.
> It has a {{forEach(BiConsumer<K, V>)}} method to allow the list to be deconstructed without creating intermediate entries.
> Potentially also {{toImmutableMap}} and {{toHashMap}} methods.



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