Improve parser so that we can show an error cursor position for errors

during parse analysis, not only errors detected in the flex/bison stages.
This is per my earlier proposal.  This commit includes all the basic
infrastructure, but locations are only tracked and reported for errors
involving column references, function calls, and operators.  More could
be done later but this seems like a good set to start with.  I've also
moved the ReportSyntaxErrorPosition logic out of psql and into libpq,
which should make it available to more people --- even within psql this
is an improvement because warnings weren't handled by ReportSyntaxErrorPosition.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out
index 0a7c5605cd..b110f08130 100644
--- a/src/test/regress/expected/join.out
+++ b/src/test/regress/expected/join.out
@@ -337,6 +337,8 @@ SELECT '' AS "xxx", *
 SELECT '' AS "xxx", i, k, t
   FROM J1_TBL CROSS JOIN J2_TBL;
 ERROR:  column reference "i" is ambiguous
+LINE 1: SELECT '' AS "xxx", i, k, t
+                            ^
 -- resolve previous ambiguity by specifying the table name
 SELECT '' AS "xxx", t1.i, k, t
   FROM J1_TBL t1 CROSS JOIN J2_TBL t2;