catalog: add mz_replacements system relation #34332
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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.
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antiguru
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Looks good, I'l approve once ready!
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I think it's ready! |
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(The random reviewer assignment chose me, but I guess @antiguru is in a better position to review this, right?) |
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I think anyone could review this, it doesn't touch any complicated logic, and all the new SQL surface is behind a feature flag and will be revisited anyway before we GA the ALTER MV feature. But Moritz' review is enough for me, no need for you to review, Gabor! |
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TFTR! |
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This PR adds a new
mz_replacementsbuiltin table, exposing the replacement MV relationship.It also adds a
replacingcolumn to theSHOW MATERIALIZED VIEWSoutput, fueled by the newmz_replacementstable. The new colum is only added when theenable_replacement_materialized_viewsfeature flag is enabled, so nothing changes for production users yet.Motivation
Part of https://github.com/MaterializeInc/database-issues/issues/9903
Tips for reviewer
Currently, the thinking is that we should instead have a new column in
mz_materialized_views. However, such a column would be immediately stabilized, so until the feature is ready for GA, we use an unstablemz_replacementstable instead.Checklist
$T ⇔ Proto$Tmapping (possibly in a backwards-incompatible way), then it is tagged with aT-protolabel.