docs(sql): cover SAMPLE BY FILL fast-path syntax and limitations#426
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docs(sql): cover SAMPLE BY FILL fast-path syntax and limitations#426
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Update the SAMPLE BY reference and the related cookbook recipes to match what the FILL fast path now accepts: - sample-by.md: list PREV(col) in the FILL options table, replace the outdated "fill strategies cannot be combined" rule with the actual PREV(col) and FILL(NONE) constraints, and rewrite the FROM-TO Limitations to drop "not compatible with FILL(PREV)" and "does not consider OFFSET". Note that keyed FROM-TO is supported when FROM/TO are constants and is rejected for bind-variable / function / arithmetic bounds. - fill-keyed-arbitrary-interval.md: scope the recipe to the bind-variable / function-bound case, since constant-bound keyed FROM-TO works natively. - fill-from-one-column.md: replace the "imagine this SQL was valid" framing with the actual FILL(PREV(col)) syntax and keep the window- function rewrite as the more flexible alternative for cases such as flagging filled rows.
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Summary
Refresh the SAMPLE BY FILL documentation to reflect what the fast-path implementation in questdb/questdb#6946 now accepts.
query/sql/sample-by.mdPREV(col)to the FILL options table and list its constraints (type match, no broadcast, no SYMBOL).FILL(NONE)rule.cookbook/sql/time-series/fill-keyed-arbitrary-interval.mdcookbook/sql/time-series/fill-from-one-column.mdFILL(PREV(col))syntax. Keep the window-function rewrite as the flexible alternative (e.g. flagging filled rows).Test plan
#from-to,#fill-options) still resolve.