Sahil Takiar created IMPALA-8826:
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Summary: Impala Doc: Add docs for PLAN_ROOT_SINK
Key: IMPALA-8826
URL: https://issues.apache.org/jira/browse/IMPALA-8826
Project: IMPALA
Issue Type: Sub-task
Components: Docs
Reporter: Sahil Takiar
Currently, I don't see many docs explaining what a {{PLAN_ROOT_SINK}} is, even
though it shows up in explain plans and runtime profiles. After more of the
changes in IMPALA-8656 are merged, understanding what {{PLAN_ROOT_SINK}} is
will be more important, because it will start taking up a memory reservation
and possibly spilling to disk.
I don't see any docs on data sinks in general, so perhaps it would be useful to
create a dedicated page for explaining data sinks and how they work. We can
start by documenting the {{PLAN_ROOT_SINK}} as that may be the most commonly
used one.
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