SQLToken: fix the handling of a new IFNOTEXISTS token

Author: macbre

sql_metadata/keywords_lists.py

@@ -33,6 +33,7 @@
     "INTO",
     "UPDATE",
     "TABLE",
+    "IFNOTEXISTS",
 }
 
 # next statement beginning after with statement

sql_metadata/token.py

@@ -262,7 +262,8 @@ def is_potential_table_name(self) -> bool:
             (self.is_name or self.is_keyword)
             and self.last_keyword_normalized in TABLE_ADJUSTMENT_KEYWORDS
             and self.previous_token.normalized not in ["AS", "WITH"]
-            and self.normalized not in ["AS", "SELECT", "IF", "SET", "WITH"]
+            and self.normalized
+            not in ["AS", "SELECT", "IF", "SET", "WITH", "IFNOTEXISTS"]
         )
 
     @property
@@ -288,7 +289,7 @@ def is_alias_of_table_or_alias_of_subquery(self) -> bool:
         is_alias_without_as = (
             self.previous_token.normalized != self.last_keyword_normalized
             and not self.previous_token.is_punctuation
-            and not self.previous_token.normalized == "EXISTS"
+            and not self.previous_token.normalized == "IFNOTEXISTS"
         )
         return is_alias_without_as or self.previous_token.is_right_parenthesis