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so that their elements are always taken as simple expressions over the query's input columns. It originally seemed like a good idea to make them act exactly like GROUP BY and ORDER BY, right down to the SQL92-era behavior of accepting output column names or numbers. However, that was not such a great idea, for two reasons: 1. It permits circular references, as exhibited in bug #5018: the output column could be the one containing the window function itself. (We actually had a regression test case illustrating this, but nobody thought twice about how confusing that would be.) 2. It doesn't seem like a good idea for, eg, "lead(foo) OVER (ORDER BY foo)" to potentially use two completely different meanings for "foo". Accordingly, narrow down the behavior of window clauses to use only the SQL99-compliant interpretation that the expressions are simple expressions. |
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| .. | ||
| analyze.h | ||
| gramparse.h | ||
| keywords.h | ||
| kwlist.h | ||
| parse_agg.h | ||
| parse_clause.h | ||
| parse_coerce.h | ||
| parse_cte.h | ||
| parse_expr.h | ||
| parse_func.h | ||
| parse_node.h | ||
| parse_oper.h | ||
| parse_relation.h | ||
| parse_target.h | ||
| parse_type.h | ||
| parse_utilcmd.h | ||
| parser.h | ||
| parsetree.h | ||
| scansup.h | ||