catalog: add mz_replacements system relation #34332
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Once materialized views can have multiple historical storage collections associated with them, we'll need to make sure to drop all of those when dropping a materialized view. There is always only a single compute collection to drop. This commit ensures we'll do the right thing and also simplifies the item dropping code a bit in the process: Instead of keeping track of indexes/MVs/CTs to drop, we instead only track compute and storage collections to drop. Doing so allows deleting a bunch of duplicate code.
This commit adds a feature flag to gate the creation and application of replacement materialized views. It's disabled by default and enabled in CI.
This commit adds a new `mz_replacements` builtin table, exposing the replacement MV relationship. It also adds a `replacing` column to the `SHOW MATERIALIZED VIEWS` output, fueled by the new `mz_replacements` table.
teskje force-pushed the mz_replacements branch from 7c6e302 to 8b0de91 Compare Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
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This PR adds a new
mz_replacementsbuiltin table, exposing the replacement MV relationship. It also adds areplacingcolumn to theSHOW MATERIALIZED VIEWSoutput, fueled by the newmz_replacementstable.Motivation
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Checklist
$T ⇔ Proto$Tmapping (possibly in a backwards-incompatible way), then it is tagged with aT-protolabel.