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Specify how group key is handled in rename/drop spec (#524) 

* Specify how group key is handled in rename/drop spec
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Adam Perlin 2018-08-01 09:09:45 -07:00 committed by GitHub
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query/docs/SPEC.md
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@ -1086,9 +1086,10 @@ Range has the following properties:
#### Rename
Rename will rename specified columns in a data table.
Rename will rename specified columns in a table.
There are two variants: one which takes a map of old column names to new column names,
and one which takes a mapping function.
and one which takes a mapping function.
If a column is renamed and is part of the group key, the column name in the group key will be updated.
Rename has the following properties:
* `columns` object
@ -1105,8 +1106,9 @@ Rename all columns with `fn` parameter: `rename(fn: (col) => "{col}_new")`
#### Drop
Drop will exclude specified columns from a returned data table. Columns to exclude can be specified either through a
Drop will exclude specified columns from a table. Columns to exclude can be specified either through a
list, or a predicate function.
When a dropped column is part of the group key it will also be dropped from the key.
Drop has the following properties:
* `columns` array of strings
@ -1123,8 +1125,9 @@ Drop all columns matching a predicate: `drop(fn: (col) => col =~ /usage*/)`
#### Keep
Keep can be thought of as the inverse of drop. It will return a table containing only columns that are specified,
Keep is the inverse of drop. It will return a table containing only columns that are specified,
ignoring all others.
Only columns in the group key that are also specified in `keep` will be kept in the resulting group key.
Keep has the following properties:
* `columns` array of strings