Revert "Do not parse ASOF and MATCH_CONDITION as table factor aliases (apache#1698)"

This reverts commit 5f4be68.

Author: Vedin

src/keywords.rs

@@ -1001,8 +1001,6 @@ pub const RESERVED_FOR_TABLE_ALIAS: &[Keyword] = &[
     Keyword::ANTI,
     Keyword::SEMI,
     Keyword::RETURNING,
-    Keyword::ASOF,
-    Keyword::MATCH_CONDITION,
     // for MSSQL-specific OUTER APPLY (seems reserved in most dialects)
     Keyword::OUTER,
     Keyword::SET,

tests/sqlparser_snowflake.rs

@@ -2731,20 +2731,6 @@ fn asof_joins() {
               "ON s.state = p.state ",
           "ORDER BY s.observed",
     ));
-
-    // Test without explicit aliases
-    #[rustfmt::skip]
-    snowflake_and_generic().verified_query(concat!(
-        "SELECT * ",
-          "FROM snowtime ",
-            "ASOF JOIN raintime ",
-              "MATCH_CONDITION (snowtime.observed >= raintime.observed) ",
-              "ON snowtime.state = raintime.state ",
-            "ASOF JOIN preciptime ",
-              "MATCH_CONDITION (showtime.observed >= preciptime.observed) ",
-              "ON showtime.state = preciptime.state ",
-          "ORDER BY showtime.observed",
-    ));
 }
 
 #[test]