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updated experimental join doc to address PR feedback

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Scott Anderson 2020-03-30 14:35:17 -06:00
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content/v2.0/reference/flux/stdlib/experimental/join.md
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The `experimental.join()` function joins two streams of tables on the The `experimental.join()` function joins two streams of tables on the
[group key](/v2.0/reference/glossary/#group-key) and `_time` column. [group key](/v2.0/reference/glossary/#group-key) and `_time` column.
Columns that are not part of the group key or explicitly mapped in the join operation Use the [`fn` parameter](#fn) to map new output tables using values from input tables.
are dropped from output tables.
{{% note %}} {{% note %}}
To join streams of tables with different fields or measuremtns, use [`group()`](/v2.0/reference/flux/stdlib/built-in/transformations/group/) To join streams of tables with different fields or measurements, use [`group()`](/v2.0/reference/flux/stdlib/built-in/transformations/group/)
or [`drop()`](/v2.0/reference/flux/stdlib/built-in/transformations/drop/) to remove or [`drop()`](/v2.0/reference/flux/stdlib/built-in/transformations/drop/) to remove
`_field` and `_measurement` from the group key before joining. `_field` and `_measurement` from the group key before joining.
_See an example [below](#join-two-streams-of-tables-with-different-fields)._ _See an example [below](#join-two-streams-of-tables-with-different-fields)._