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opt: disable
GenerateParameterizedJoin
when forcing custom plans
The exploration rule `GenerateParameterizedJoin` is now disabled when the `plan_cache_mode` session setting is set to `force_custom_plan`. This prevents possible regressions in plans for this mode in the rare case that a stable function is not folded during normalization (due to an error encountered during folding). In most cases, the check for placeholders and stable functions in `GenerateParameterizedJoin` is sufficient for preventing the rule from firing when a generic query plan is not being built—before optimizing a custom plan placeholders are always replaced with constants and stable functions are usually folded to constants. Release note: None
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