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Replace run-time error check with assertion

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The error message was checking that the structures returned from the
parser matched expectations.  That's something we usually use
assertions for, not a full user-facing error message.  So replace that
with an assertion (hidden inside lfirst_node()).

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/452e9df8-ec89-e01b-b64a-8cc6ce830458%40enterprisedb.com
This commit is contained in:
Peter Eisentraut
2021-05-27 09:52:12 +02:00
parent 2941138e60
commit 388e75ad33
1 changed files with 5 additions and 16 deletions
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21
src/backend/commands/statscmds.c
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@ -220,26 +220,14 @@ CreateStatistics(CreateStatsStmt *stmt)
*/
foreach(cell, stmt->exprs)
{
Node *expr = (Node *) lfirst(cell);
StatsElem *selem;
HeapTuple atttuple;
Form_pg_attribute attForm;
TypeCacheEntry *type;
/*
* We should not get anything else than StatsElem, given the grammar.
* But let's keep it as a safety.
*/
if (!IsA(expr, StatsElem))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("only simple column references and expressions are allowed in CREATE STATISTICS")));
selem = (StatsElem *) expr;
StatsElem *selem = lfirst_node(StatsElem, cell);
if (selem->name) /* column reference */
{
char *attname;
HeapTuple atttuple;
Form_pg_attribute attForm;
TypeCacheEntry *type;
attname = selem->name;
@ -273,6 +261,7 @@ CreateStatistics(CreateStatsStmt *stmt)
{
Node *expr = selem->expr;
Oid atttype;
TypeCacheEntry *type;
Assert(expr != NULL);