perf: partially lift matching from regexp to js #9032
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Digging further into typeorm#3857. See also typeorm#8955, typeorm#8956. As [previously discussed](typeorm#3857 (comment)), the query builder currently suffers from poor performance in two ways: quadratic numbers of operations with respect to total table/column counts, and poor constant factor performance (regexps can be expensive to build/run!) The constant-factor performance is the more tractable problem: no longer quadratically looping would be a chunky rewrite of the query builder, but we can locally refactor to be a bunch cheaper in terms of regexp operations. This change cuts the benchmark time here in ~half (yay!). We achieve this by simplifying the overall replacement regexp (we don't need our column names in there, since we already have a plain object where they're the keys to match against) so compilation of that is much cheaper, plus skipping the need to `escapeRegExp` every column as a result.
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Looks awesome! Thank you very much! |
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happy to contribute @pleerock :) |
draaglom
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Digging further into typeorm#3857. See also typeorm#8955, typeorm#8956. As [previously discussed](typeorm#3857 (comment)), the query builder currently suffers from poor performance in two ways: quadratic numbers of operations with respect to total table/column counts, and poor constant factor performance (regexps can be expensive to build/run!) The constant-factor performance is the more tractable problem: no longer quadratically looping would be a chunky rewrite of the query builder, but we can locally refactor to be a bunch cheaper in terms of regexp operations. This change cuts the benchmark time here in ~half (yay!). We achieve this by simplifying the overall replacement regexp (we don't need our column names in there, since we already have a plain object where they're the keys to match against) so compilation of that is much cheaper, plus skipping the need to `escapeRegExp` every column as a result.
frangz
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Nov 14, 2022
Digging further into typeorm#3857. See also typeorm#8955, typeorm#8956. As [previously discussed](typeorm#3857 (comment)), the query builder currently suffers from poor performance in two ways: quadratic numbers of operations with respect to total table/column counts, and poor constant factor performance (regexps can be expensive to build/run!) The constant-factor performance is the more tractable problem: no longer quadratically looping would be a chunky rewrite of the query builder, but we can locally refactor to be a bunch cheaper in terms of regexp operations. This change cuts the benchmark time here in ~half (yay!). We achieve this by simplifying the overall replacement regexp (we don't need our column names in there, since we already have a plain object where they're the keys to match against) so compilation of that is much cheaper, plus skipping the need to `escapeRegExp` every column as a result.
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frangz
pushed a commit
to loyaltylion/typeorm
that referenced
this pull request
Nov 14, 2022
Digging further into typeorm#3857. See also typeorm#8955, typeorm#8956. As [previously discussed](typeorm#3857 (comment)), the query builder currently suffers from poor performance in two ways: quadratic numbers of operations with respect to total table/column counts, and poor constant factor performance (regexps can be expensive to build/run!) The constant-factor performance is the more tractable problem: no longer quadratically looping would be a chunky rewrite of the query builder, but we can locally refactor to be a bunch cheaper in terms of regexp operations. This change cuts the benchmark time here in ~half (yay!). We achieve this by simplifying the overall replacement regexp (we don't need our column names in there, since we already have a plain object where they're the keys to match against) so compilation of that is much cheaper, plus skipping the need to `escapeRegExp` every column as a result.
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Description of change
Digging further into #3857.
See also #8955, #8956.
As previously discussed, the query builder currently suffers from poor performance in two ways:
counts
to build/run!)
The constant-factor performance is the more tractable problem: no longer
quadratically looping would be a chunky rewrite of the query builder,
but we can locally refactor to be a bunch cheaper in terms of regexp
operations.
This change cuts the benchmark time here in ~half (yay!).
We achieve this by simplifying the overall replacement regexp (we don't
need our column names in there, since we already have a plain object
where they're the keys to match against) so compilation of that is much
cheaper, plus skipping the need to
escapeRegExpevery column as aresult.
Pull-Request Checklist
masterbranchnpm run formatto apply prettier formattingnpm run testpasses with this changeFixes #0000