sql: fix data race in ResolvableFunctionReference #45919
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otan
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Mar 10, 2020
Previously, ResolvableFunctionReference was the site of a data race in which statements like SHOW QUERIES, which need to format an AST concurrently with query planning and running, raced with the query planner which as a side effect of planning mutates ResolvableFunctionReference. Ideally, ResolvableFunctionReference would be immutable like a good little AST node. This commit separates ResolvableFunctionReference into two fields, one immutable (the UnresolvedName that it starts with from the parser) and one mutable (the resolved function itself). The formatter only reads the immutable part, so the planner is free to mutate the resolved part as it wishes. Release note: None
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Previously, ResolvableFunctionReference was the site of a data race in
which statements like SHOW QUERIES, which need to format an AST
concurrently with query planning and running, raced with the query
planner which as a side effect of planning mutates
ResolvableFunctionReference. Ideally, ResolvableFunctionReference would
be immutable like a good little AST node.
This commit separates ResolvableFunctionReference into two fields, one
immutable (the UnresolvedName that it starts with from the parser) and
one mutable (the resolved function itself). The formatter only reads the
immutable part, so the planner is free to mutate the resolved part as it
wishes.
Fixes #28033
@RaduBerinde I wonder if we could change things up a bit during planning to get rid of this problem entirely, but I think this is a good fix for now.
Release note: None