[copy_from] Support specifying a column map in COPY ... FROM <url>
#31580
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* in planning create an MFP that we can pass down to clusterd * in sequencing turn the provided MFP into a SafeMfpPlan * in clusterd evaluate the SafeMfpPlan for every row we decode
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COPY ... FROM <url>COPY ... FROM <url>
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This PR adds support for specifying a column mapping and filling in default values for
COPY ... FROM <url>(akaOneshotSource).Let's say we ran
CREATE TABLE t1 (c1 text, c2 text, c3 text DEFAULT 'apple'), so our table has 3 columns, but the file we're copying into Materialize only has 2 columns. After this PR you could runCOPY INTO t1 (c2, c1) FROM <url>and it would map the first column of the data tot1.c2, the second column tot1.c1, and it would fill in the default value of'apple'for all values int1.c3.We do this by planning a
MapFilterProject, converting it into aSafeMfpPlan, and then inclusterdwhen decoding data evaluating theSafeMfpPlanfor every row.Motivation
Fixes https://github.com/MaterializeInc/database-issues/issues/8858
Tips for reviewer
There are no tests in this PR, they are included as part of #31581
Checklist
$T ⇔ Proto$Tmapping (possibly in a backwards-incompatible way), then it is tagged with aT-protolabel.