From 2bfb50b3df11399ed80347dd03bfaf8cd5acf962 Mon Sep 17 00:00:00 2001
From: Dean Rasheed <dean.a.rasheed@gmail.com>
Date: Thu, 15 Jul 2021 08:49:45 +0100
Subject: Improve reporting of "conflicting or redundant options" errors.

When reporting "conflicting or redundant options" errors, try to
ensure that errposition() is used, to help the user identify the
offending option.

Formerly, errposition() was invoked in less than 60% of cases. This
patch raises that to over 90%, but there remain a few places where the
ParseState is not readily available. Using errdetail() might improve
the error in such cases, but that is left as a task for the future.

Additionally, since this error is thrown from over 100 places in the
codebase, introduce a dedicated function to throw it, reducing code
duplication.

Extracted from a slightly larger patch by Vignesh C. Reviewed by
Bharath Rupireddy, Alvaro Herrera, Dilip Kumar, Hou Zhijie, Peter
Smith, Daniel Gustafsson, Julien Rouhaud and me.

Discussion: https://postgr.es/m/CALDaNm33FFSS5tVyvmkoK2cCMuDVxcui=gFrjti9ROfynqSAGA@mail.gmail.com
---
 src/backend/commands/sequence.c | 45 +++++++++--------------------------------
 1 file changed, 9 insertions(+), 36 deletions(-)

(limited to 'src/backend/commands/sequence.c')

diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index d22d767d2fa..72bfdc07a49 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -1261,90 +1261,63 @@ init_params(ParseState *pstate, List *options, bool for_identity,
 		if (strcmp(defel->defname, "as") == 0)
 		{
 			if (as_type)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			as_type = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "increment") == 0)
 		{
 			if (increment_by)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			increment_by = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "start") == 0)
 		{
 			if (start_value)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			start_value = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "restart") == 0)
 		{
 			if (restart_value)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			restart_value = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "maxvalue") == 0)
 		{
 			if (max_value)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			max_value = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "minvalue") == 0)
 		{
 			if (min_value)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			min_value = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "cache") == 0)
 		{
 			if (cache_value)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			cache_value = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "cycle") == 0)
 		{
 			if (is_cycled)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			is_cycled = defel;
 			*need_seq_rewrite = true;
 		}
 		else if (strcmp(defel->defname, "owned_by") == 0)
 		{
 			if (*owned_by)
-				ereport(ERROR,
-						(errcode(ERRCODE_SYNTAX_ERROR),
-						 errmsg("conflicting or redundant options"),
-						 parser_errposition(pstate, defel->location)));
+				errorConflictingDefElem(defel, pstate);
 			*owned_by = defGetQualifiedName(defel);
 		}
 		else if (strcmp(defel->defname, "sequence_name") == 0)
-- 
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