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Make it work with PL/Container #223
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This PR is based on PR https://github.com/greenplum-db/plcontainer/pull/696 and should be merged after that. |
This PR allows to pass specific columns when using plcontainer_apply.
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Previously, PL/Python3 is the only language handler we support. While
it is easy to work with, only
SUPERUSERcan use it. This greatlylimits its use cases.
This patch overcomes the limitation by adding
PL/Container as
another supported language handler. Unlike PL/Python, PL/Container
strives to be a
TRUSTEDlanguage. With PL/Container, all userswill be able to create and execute any Python functions in database.
The implementation is based on
plcontainer_apply(). It is ahigher-order UDF that applies a given UDF to a table (aka DataFrame
in GreenplumPython). Compared to conventional way to call UDFs, it
This can greatly improve performance compared to passing one row at
a time.
array_agg().