reuvenlax commented on issue #11041: Use beam join api in sql URL: https://github.com/apache/beam/pull/11041#issuecomment-601289835 @kennknowles @apilloud A quick summary: This switches SQL to use the schema Join API. This should be more efficient in some cases, but more importantly it greatly simplifies the join code in SQL. As part of this, several bugs and gaps were discovered in the schema APIs. One was fixed in a previous PR, and the rest are in this PR. This also adds "broadcast" join capability to the schema Join API. This replaces the side-input join functionality that previously was implemented in SQL. Lookup join remains in SQL. I'm not sure it's worth (i.e. that it's a general-enough use case) trying to pull this into the core Beam transforms.
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