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Avoid copies when passing binary parameters#1
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robx merged 5 commits intoPostgREST:masterfrom Sep 5, 2022
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There were two identical copies each of the parameter mangling code.
Instead of building a list of 'Int' in the fold, and then mapping 'toEnum' over it, build a list of 'CInt' directly.
We encode various arrays of the same length through 'withArray'. Each of these computes the length, so we might as well take the length from one of these.
steve-chavez
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This pulls in the change from PostgREST/postgresql-libpq#1.
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This pulls in the change from PostgREST/postgresql-libpq#1.
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This pulls in the change from PostgREST/postgresql-libpq#1.
robx
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This pulls in the change from PostgREST/postgresql-libpq#1.
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This is haskellari#22, filed against this forked repo. As with
hasql-pool, hoping to get this upstream eventually, but let's move forward like this for now.Currently, the library copies every input parameter when passing it to libpq via
Data.ByteString.useAsCString. This PR avoids those copies for the case of binary parameters, by usingData.ByteString.Unsafe.unsafeUseAsCString.I claim that this is safe because:
ByteStringuses pinned memoryThere are a few preparatory commits to factor out duplicate code to
withParams, and to avoid a bit of unnecessary work there.Context is PostgREST/postgrest#2261. We see significant decrease of memory use with this change: PostgREST/postgrest#2349