added assumption clauses

mo_sql_parsing/keywords.py

@@ -21,6 +21,7 @@ DESC = keyword("desc")
 
 # SIMPLE KEYWORDS
 AS = keyword("as").suppress()
+ASSUMING = keyword("assuming")
 ALL = keyword("all")
 BY = keyword("by").suppress()
 CAST = keyword("cast")
@@ -162,6 +163,7 @@ RESERVED = MatchFirst([
     AND,
     AS,
     ASC,
+    ASSUMING, 
     BETWEEN,
     BY,
     CASE,

mo_sql_parsing/sql_parser.py

@@ -407,9 +407,11 @@ def parser(literal_string, ident, sqlserver=False):
             )
             + RB,
         )
+        assumption = (ASSUMING + (ASC|DESC)("assumption"))
 
         table_source << Group(
             ((LB + query + RB) | stack | call_function | var_name)("value")
+            + Optional(assumption)
             + Optional(flag("with ordinality"))
             + Optional(tablesample)
             + alias

run.py

@@ -4,3 +4,12 @@ q = 'SELECT p.Name, v.Name FROM Production.Product p JOIN Purchasing.ProductVend
 res = parser.parse(q)
 
 print(res)
+
+while True:
+    try:
+        q = input()
+        stmts = parser.parse(q)
+        for s in stmts:
+            print(s)
+    except Exception as e:
+        print(e)