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Melanie Plageman
f72f5aa1a9
Add an AM user-settable flags parameter to several of the table scan functions, one table AM callback, and index_beginscan(). This allows users to pass additional context to be used when building the scan descriptors. For index scans, a new flags field is added to IndexFetchTableData, and the heap AM saves the caller-provided flags there. This introduces an extension point for follow-up work to pass per-scan information (such as whether the relation is read-only for the current query) from the executor to the AM layer. Author: Melanie Plageman <[email protected]> Reviewed-by: Andres Freund <[email protected]> Reviewed-by: Tomas Vondra <[email protected]> Reviewed-by: David Rowley <[email protected]> Reviewed-by: Chao Li <[email protected]> Discussion: https://postgr.es/m/2be31f17-5405-4de9-8d73-90ebc322f7d8%40vondra.me