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* Improved error reporting in format()
@ 2016-01-02 23:57 Jim Nasby <Jim.Nasby@BlueTreble.com>
0 siblings, 1 reply; 3+ messages in thread
From: Jim Nasby @ 2016-01-02 23:57 UTC (permalink / raw)
To: pgsql-hackers
The current error message for an invalid format conversion type is
extremely confusing except in the simplest of uses:
select format( '% moo');
ERROR: unrecognized conversion type specifier " "
Obviously in that example you can figure out what's going on, but
frequently format() is used in a complex context where it's not at all
obvious that format is the problem. Even worse, "conversion" makes it
sound like a localization issue.
Attached patch clarifies that %-related error messages with hints as
well as (IMHO) improving the clarity of the message:
select format( '% moo');
ERROR: unrecognized format() type specifier " "
HINT: For a single "%" use "%%"
I also made the use of "format()" consistent in all the other error
messages.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
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Attachments:
patch.diff (text/plain, 1.7K) download
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c
index a89f586..a4552ad 100644
--- a/src/backend/utils/adt/varlena.c
+++ b/src/backend/utils/adt/varlena.c
@@ -4647,7 +4647,8 @@ text_reverse(PG_FUNCTION_ARGS)
if (++(ptr) >= (end_ptr)) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
- errmsg("unterminated format specifier"))); \
+ errmsg("unterminated format() type specifier"), \
+ errhint("For a single \"%%\" use \"%%%%\"."))); \
} while (0)
/*
@@ -4779,8 +4780,9 @@ text_format(PG_FUNCTION_ARGS)
if (strchr("sIL", *cp) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("unrecognized conversion type specifier \"%c\"",
- *cp)));
+ errmsg("unrecognized format() type specifier \"%c\"",
+ *cp),
+ errhint("For a single \"%%\" use \"%%%%\".")));
/* If indirect width was specified, get its value */
if (widthpos >= 0)
@@ -4791,7 +4793,7 @@ text_format(PG_FUNCTION_ARGS)
if (arg >= nargs)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("too few arguments for format")));
+ errmsg("too few arguments for format()")));
/* Get the value and type of the selected argument */
if (!funcvariadic)
@@ -4899,8 +4901,9 @@ text_format(PG_FUNCTION_ARGS)
/* should not get here, because of previous check */
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("unrecognized conversion type specifier \"%c\"",
- *cp)));
+ errmsg("unrecognized format() type specifier \"%c\"",
+ *cp),
+ errhint("For a single \"%%\" use \"%%%%\".")));
break;
}
}
* Re: Improved error reporting in format()
@ 2016-01-03 01:19 Jim Nasby <Jim.Nasby@BlueTreble.com>
parent: Jim Nasby <Jim.Nasby@BlueTreble.com>
0 siblings, 1 reply; 3+ messages in thread
From: Jim Nasby @ 2016-01-03 01:19 UTC (permalink / raw)
To: pgsql-hackers
On 1/2/16 5:57 PM, Jim Nasby wrote:
> Attached patch clarifies that %-related error messages with hints as
> well as (IMHO) improving the clarity of the message:
Sorry, forgot to update regression tests. New patch attached.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
--
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Attachments:
patch.diff (text/plain, 2.9K) download
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c
index 8683188..9583ed0 100644
--- a/src/backend/utils/adt/varlena.c
+++ b/src/backend/utils/adt/varlena.c
@@ -4647,7 +4647,8 @@ text_reverse(PG_FUNCTION_ARGS)
if (++(ptr) >= (end_ptr)) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
- errmsg("unterminated format specifier"))); \
+ errmsg("unterminated format() type specifier"), \
+ errhint("For a single \"%%\" use \"%%%%\"."))); \
} while (0)
/*
@@ -4779,8 +4780,9 @@ text_format(PG_FUNCTION_ARGS)
if (strchr("sIL", *cp) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("unrecognized conversion type specifier \"%c\"",
- *cp)));
+ errmsg("unrecognized format() type specifier \"%c\"",
+ *cp),
+ errhint("For a single \"%%\" use \"%%%%\".")));
/* If indirect width was specified, get its value */
if (widthpos >= 0)
@@ -4791,7 +4793,7 @@ text_format(PG_FUNCTION_ARGS)
if (arg >= nargs)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("too few arguments for format")));
+ errmsg("too few arguments for format()")));
/* Get the value and type of the selected argument */
if (!funcvariadic)
@@ -4899,8 +4901,9 @@ text_format(PG_FUNCTION_ARGS)
/* should not get here, because of previous check */
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("unrecognized conversion type specifier \"%c\"",
- *cp)));
+ errmsg("unrecognized format() type specifier \"%c\"",
+ *cp),
+ errhint("For a single \"%%\" use \"%%%%\".")));
break;
}
}
diff --git a/src/test/regress/expected/text.out b/src/test/regress/expected/text.out
index 1587046..a74b9ce 100644
--- a/src/test/regress/expected/text.out
+++ b/src/test/regress/expected/text.out
@@ -211,7 +211,8 @@ ERROR: too few arguments for format
select format('Hello %s');
ERROR: too few arguments for format
select format('Hello %x', 20);
-ERROR: unrecognized conversion type specifier "x"
+ERROR: unrecognized format() type specifier "x"
+HINT: For a single "%" use "%%".
-- check literal and sql identifiers
select format('INSERT INTO %I VALUES(%L,%L)', 'mytab', 10, 'Hello');
format
@@ -263,9 +264,11 @@ ERROR: format specifies argument 0, but arguments are numbered from 1
select format('%*0$s', 'Hello');
ERROR: format specifies argument 0, but arguments are numbered from 1
select format('%1$', 1);
-ERROR: unterminated format specifier
+ERROR: unterminated format() type specifier
+HINT: For a single "%" use "%%".
select format('%1$1', 1);
-ERROR: unterminated format specifier
+ERROR: unterminated format() type specifier
+HINT: For a single "%" use "%%".
-- check mix of positional and ordered placeholders
select format('Hello %s %1$s %s', 'World', 'Hello again');
format
* Re: Improved error reporting in format()
@ 2016-02-11 15:11 Teodor Sigaev <teodor@sigaev.ru>
parent: Jim Nasby <Jim.Nasby@BlueTreble.com>
0 siblings, 0 replies; 3+ messages in thread
From: Teodor Sigaev @ 2016-02-11 15:11 UTC (permalink / raw)
To: Jim Nasby <Jim.Nasby@BlueTreble.com>; pgsql-hackers
Thank you, committed
Jim Nasby wrote:
> On 1/2/16 5:57 PM, Jim Nasby wrote:
>> Attached patch clarifies that %-related error messages with hints as
>> well as (IMHO) improving the clarity of the message:
>
> Sorry, forgot to update regression tests. New patch attached.
>
>
>
--
Teodor Sigaev E-mail: teodor@sigaev.ru
WWW: http://www.sigaev.ru/
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2016-01-02 23:57 Improved error reporting in format() Jim Nasby <Jim.Nasby@BlueTreble.com>
2016-01-03 01:19 ` Jim Nasby <Jim.Nasby@BlueTreble.com>
2016-02-11 15:11 ` Teodor Sigaev <teodor@sigaev.ru>
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