public inbox for [email protected]
help / color / mirror / Atom feedFrom: jian he <[email protected]>
To: Pavel Stehule <[email protected]>
Cc: Dmitry Dolgov <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Erik Rijkers <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: DUVAL REMI <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Re: proposal: schema variables
Date: Sun, 29 Dec 2024 00:46:28 +0800
Message-ID: <CACJufxEb1prZo4G4BhYym1VqKHaPVUv3SoggTR4uCqgCRY7Q-Q@mail.gmail.com> (raw)
In-Reply-To: <CAFj8pRBxA868TpLDe9ofXdpVUNmHY8pzkxrjbZ0obCe0g+YZ-Q@mail.gmail.com>
References: <CAFj8pRC+hPCc2X88xC=pTJoqmVPApDsageZOMyqaxi5788WxHA@mail.gmail.com>
<CAFj8pRDJ9cq00VYSHxs6LsoHNWjhYXyWWBtV6UgeWwhs0AHa9A@mail.gmail.com>
<CAFj8pRBPXTcw_3fpKtgVthV2+9rZGhxitZ40DnAwCrK601TZZg@mail.gmail.com>
<ndtfl4tsnpkb7m7hwvnmlpsascpgd3a7xvjmjhtxffsbrgygtm@4du6zsmnnwq5>
<CAFj8pRAu4XvNCGu1751t=2YEqLqTjDA3FavMExm2S0KYQq=DdQ@mail.gmail.com>
<CAFj8pRAsEoeZv0HEnA8CKgFKDSQ-wYw18Os1vdksWCV7ez2bVw@mail.gmail.com>
<3chredgnjcmccym2kczawfih226b4ac6co7p6z4jeofevrcosi@mrsxkx2x2c65>
<CAFj8pRBoWPDTOwn5FmMzc+1qiopw+N04U26nviOdF61fs8A2wQ@mail.gmail.com>
<stckyvkl4yyzvgjsaawojs3xikke7mmds5bhv7l7qerclywywk@h4v4n43xm6u2>
<CAFj8pRB_E1GM_YGT-ti4bXka6mhLdAAFeTe+BHgHFYC+qb-76g@mail.gmail.com>
<[email protected]>
<CAFj8pRBWqEb8i6WmrF_Xh64=48GtisKijgczMv7HTTpe4GswuA@mail.gmail.com>
<CAFj8pRAry0esQiHcK=6BwwFKDY0zanug6k07CEQzRPBqZ6iW0Q@mail.gmail.com>
<CACJufxFNjKrmyEi9SLfPCq4c9GUN+5eoOtbZwBPq9eKoO8REUw@mail.gmail.com>
<CAFj8pRALQ-j-Dz3R1ivCoXut8LEhN+kSa7U8Gshucdv5zU3AfQ@mail.gmail.com>
<CACJufxG7LvaNbF8ZSCcxOVUbm9W=KGjD=h_Wk+5imMw4s_2QxA@mail.gmail.com>
<CAFj8pRBY_2awVdER5piyy_JPqsU1Sgr4HLO-v6C1nUS3dJnang@mail.gmail.com>
<CACJufxEM=BLEn6YfgGonM7yuXMn7iqQJcH5PnDVbajWKanynfg@mail.gmail.com>
<CAFj8pRBxA868TpLDe9ofXdpVUNmHY8pzkxrjbZ0obCe0g+YZ-Q@mail.gmail.com>
hi.
+ if (stmt->collClause)
+ collation = LookupCollation(pstate,
+ stmt->collClause->collname,
+ stmt->collClause->location);
+ else
+ collation = typcollation;;
two semi-colon. should be only one.
------------------<<>>>---------------
+ /* locks the variable with an AccessShareLock */
+ varid = IdentifyVariable(names, &attrname, ¬_unique, false);
+ if (not_unique)
+ ereport(ERROR,
+ (errcode(ERRCODE_AMBIGUOUS_PARAMETER),
+ errmsg("target \"%s\" of LET command is ambiguous",
+ NameListToString(names)),
+ parser_errposition(pstate, stmt->location)));
the following are tests for the above "LET command is ambiguous" error message.
create schema test;
CREATE TYPE test AS (test int);
CREATE variable test.test as test;
set search_path to test;
let test.test = 1;
------------------<<>>>---------------
+ else
+ {
+ /* the last field of list can be star too */
+ Assert(IsA(field2, A_Star));
+
+ /*
+ * In this case, the field1 should be variable name. But
+ * direct unboxing of composite session variables is not
+ * supported now, and then we don't need to try lookup
+ * related variable.
+ *
+ * Unboxing is supported by syntax (var).*
+ */
+ return InvalidOid;
+ }
I don't fully understand the above comments,
add
`elog(INFO, "%s:%d called", __FILE__, __LINE__); ` within the ELSE branch.
Then I found out the ELSE branch doesn't have coverage tests.
------------------<<>>>---------------
+ /*
+ * a.b.c can mean catalog.schema.variable or
+ * schema.variable.field.
....
+ /*
+ * a.b can mean "schema"."variable" or "variable"."field".
+ * Check both variants, and returns InvalidOid with
+ * not_unique flag, when both interpretations are
+ * possible.
+ */
here, we use the word "field", but the function IdentifyVariable above
comment, we use
word "attribute", for consistency's sake, we should use "attribute"
instead of "field"
+/* -----
+ * IdentifyVariable - try to find a variable from a list of identifiers
+ *
+ * Returns the OID of the variable found, or InvalidOid.
+ *
+ * "names" is a list of up to four identifiers; possible meanings are:
+ * - variable (searched on the search_path)
+ * - schema.variable
+ * - variable.attribute (searched on the search_path)
+ * - schema.variable.attribute
+ * - database.schema.variable
+ * - database.schema.variable.attribute
------------------<<>>>---------------
view thread (439+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
Subject: Re: Re: proposal: schema variables
In-Reply-To: <CACJufxEb1prZo4G4BhYym1VqKHaPVUv3SoggTR4uCqgCRY7Q-Q@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox