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Fix typos in comments
The changes done in this commit impact comments with no direct user-visible changes, with fixes for incorrect function, variable or structure names. Author: Alexander Lakhin Discussion: https://postgr.es/m/e8c38840-596a-83d6-bd8d-cebc51111572@gmail.com
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@ -4210,7 +4210,7 @@ estimate_multivariate_ndistinct(PlannerInfo *root, RelOptInfo *rel,
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* Process complex expressions, not just simple Vars.
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*
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* First, we search for an exact match of an expression. If we
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* find one, we can just discard the whole GroupExprInfo, with all
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* find one, we can just discard the whole GroupVarInfo, with all
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* the variables we extracted from it.
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*
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* Otherwise we inspect the individual vars, and try matching it
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