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feat: allow SELECT without target expressions for PostgreSQL - #2841
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Making the select-items group optional for the target-less PostgreSQL SELECT let JavaCC see K_AS in the follow set of the optional AS STRUCT/VALUE qualifier block, producing a choice conflict at the block. Guard it with an explicit lookahead so AS only opens the qualifier when STRUCT or VALUE comes next.
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Resolves #2784.
PostgreSQL permits a SELECT with no target expressions, e.g.
which fails with a parse error because
SelectItemsListrequires at least oneSelectItem.With this change
PlainSelectaccepts an absent select-item list when the POSTGRESQL dialect is active andFROMfollowsSELECTdirectly. The parsed model exposes an empty select-items list rather than anUNSPECIFICnode, and both thetoStringpath andSelectDeParseravoid emitting a doubled space inSELECT FROMwhen the list is empty. Other dialects and all existing SELECT forms are unchanged.10,733 tests, 0 failures, 25 skipped.