[antlr-interest] PLSQL parsing nondeterminism

[Swapnil Kashikar]

Hi,
I am very new to antlr.
I was trying to parse PLSQL select  statement with the following grammar and
got the following warning:
Can't figure out what alt 1 and alt 2 are and how to remove this
non-determinism.
Thanks,
SKashikar

--------------
warning: nondeterminism between alts 1 and 2 of block upon
k==1 CONNECT
k==2 BY
--------------
The grammar snippet is :

subquery :
  "SELECT"
 (distinct_all_or_unique)? select_list
 from_clause
 (where_clause)?
 (hierarchical_query_clause)?
 (group_by_clause)?
 (having_clause)?
 (subquery_clause)?
 (order_by_clause)?
 ;

hierarchical_query_clause :
 "CONNECT" "BY" connect_by_expression
 ;

connect_by_expression : expression
 ;
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