Attached patch adds YAML output option to explain: explain (format YAML) select * from information_schema.columns;
-- Greg Sabino Mullane g...@turnstep.com PGP Key: 0x14964AC8 200908281414 http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
Index: contrib/auto_explain/auto_explain.c
===================================================================
RCS file: /projects/cvsroot/pgsql/contrib/auto_explain/auto_explain.c,v
retrieving revision 1.7
diff -u -r1.7 auto_explain.c
--- contrib/auto_explain/auto_explain.c 10 Aug 2009 05:46:49 -0000 1.7
+++ contrib/auto_explain/auto_explain.c 28 Aug 2009 18:12:49 -0000
@@ -29,6 +29,7 @@
{"text", EXPLAIN_FORMAT_TEXT, false},
{"xml", EXPLAIN_FORMAT_XML, false},
{"json", EXPLAIN_FORMAT_JSON, false},
+ {"yaml", EXPLAIN_FORMAT_YAML, false},
{NULL, 0, false}
};
Index: doc/src/sgml/auto-explain.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/auto-explain.sgml,v
retrieving revision 1.4
diff -u -r1.4 auto-explain.sgml
--- doc/src/sgml/auto-explain.sgml 10 Aug 2009 05:46:50 -0000 1.4
+++ doc/src/sgml/auto-explain.sgml 28 Aug 2009 18:12:49 -0000
@@ -114,7 +114,7 @@
<varname>auto_explain.log_format</varname> selects the
<command>EXPLAIN</> output format to be used.
The allowed values are <literal>text</literal>, <literal>xml</literal>,
- and <literal>json</literal>. The default is text.
+ <literal>json</literal>, and <literal>yaml</literal>. The default is text.
Only superusers can change this setting.
</para>
</listitem>
Index: doc/src/sgml/release-8.5.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/release-8.5.sgml,v
retrieving revision 1.4
diff -u -r1.4 release-8.5.sgml
--- doc/src/sgml/release-8.5.sgml 19 Aug 2009 08:18:48 -0000 1.4
+++ doc/src/sgml/release-8.5.sgml 28 Aug 2009 18:12:49 -0000
@@ -96,7 +96,7 @@
<itemizedlist>
<listitem>
<para>
- EXPLAIN allows output of plans in XML or JSON format for automated
+ EXPLAIN allows output of plans in XML, JSON, or YAML format for automated
processing of explain plans by analysis or visualization tools.
</para>
</listitem>
Index: doc/src/sgml/ref/explain.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/explain.sgml,v
retrieving revision 1.46
diff -u -r1.46 explain.sgml
--- doc/src/sgml/ref/explain.sgml 10 Aug 2009 05:46:50 -0000 1.46
+++ doc/src/sgml/ref/explain.sgml 28 Aug 2009 18:12:49 -0000
@@ -31,7 +31,7 @@
<refsynopsisdiv>
<synopsis>
-EXPLAIN [ ( { ANALYZE <replaceable class="parameter">boolean</replaceable> | VERBOSE <replaceable class="parameter">boolean</replaceable> | COSTS <replaceable class="parameter">boolean</replaceable> | FORMAT { TEXT | XML | JSON } } [, ...] ) ] <replaceable class="parameter">statement</replaceable>
+EXPLAIN [ ( { ANALYZE <replaceable class="parameter">boolean</replaceable> | VERBOSE <replaceable class="parameter">boolean</replaceable> | COSTS <replaceable class="parameter">boolean</replaceable> | FORMAT { TEXT | XML | JSON | YAML } } [, ...] ) ] <replaceable class="parameter">statement</replaceable>
EXPLAIN [ ANALYZE ] [ VERBOSE ] <replaceable class="parameter">statement</replaceable>
</synopsis>
</refsynopsisdiv>
@@ -143,8 +143,8 @@
<term><literal>FORMAT</literal></term>
<listitem>
<para>
- Specify the output format, which can be TEXT, XML, or JSON.
- XML or JSON output contains the same information as the text output
+ Specify the output format, which can be TEXT, XML, JSON, or YAML.
+ Non-text output contains the same information as the text output
format, but is easier for programs to parse. This parameter defaults to
<literal>TEXT</literal>.
</para>
Index: src/backend/commands/explain.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/commands/explain.c,v
retrieving revision 1.190
diff -u -r1.190 explain.c
--- src/backend/commands/explain.c 22 Aug 2009 02:06:32 -0000 1.190
+++ src/backend/commands/explain.c 28 Aug 2009 18:12:49 -0000
@@ -96,6 +96,7 @@
static void ExplainXMLTag(const char *tagname, int flags, ExplainState *es);
static void ExplainJSONLineEnding(ExplainState *es);
static void escape_json(StringInfo buf, const char *str);
+static void escape_yaml(StringInfo buf, const char *str);
/*
@@ -137,6 +138,8 @@
es.format = EXPLAIN_FORMAT_XML;
else if (strcmp(p, "json") == 0)
es.format = EXPLAIN_FORMAT_JSON;
+ else if (strcmp(p, "yaml") == 0)
+ es.format = EXPLAIN_FORMAT_YAML;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
@@ -1509,6 +1512,18 @@
}
appendStringInfoChar(es->str, ']');
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ appendStringInfoSpaces(es->str, es->indent * 2);
+ appendStringInfo(es->str, "%s:\n", qlabel);
+ foreach(lc, data)
+ {
+ appendStringInfoSpaces(es->str, es->indent * 2 + 2);
+ appendStringInfoString(es->str, "- ");
+ escape_yaml(es->str, qlabel);
+ appendStringInfoChar(es->str, '\n');
+ }
+ break;
}
}
@@ -1556,6 +1571,17 @@
else
escape_json(es->str, value);
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ appendStringInfoSpaces(es->str, es->indent * 2);
+ appendStringInfo(es->str, "%s: ", qlabel);
+ if (numeric)
+ appendStringInfoString(es->str, value);
+ else
+ escape_yaml(es->str, value);
+ appendStringInfoChar(es->str, '\n');
+ break;
+
}
}
@@ -1640,6 +1666,19 @@
es->grouping_stack = lcons_int(0, es->grouping_stack);
es->indent++;
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ appendStringInfoSpaces(es->str, 2 * es->indent);
+ if (labelname)
+ {
+ appendStringInfo(es->str, "%s:\n", labelname);
+ }
+ else {
+ appendStringInfoString(es->str, "-\n");
+ }
+ es->indent++;
+ break;
+
}
}
@@ -1669,6 +1708,10 @@
appendStringInfoChar(es->str, labeled ? '}' : ']');
es->grouping_stack = list_delete_first(es->grouping_stack);
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ es->indent--;
+ break;
}
}
@@ -1693,7 +1736,6 @@
case EXPLAIN_FORMAT_JSON:
ExplainJSONLineEnding(es);
- appendStringInfoSpaces(es->str, 2 * es->indent);
if (labelname)
{
escape_json(es->str, labelname);
@@ -1701,6 +1743,15 @@
}
escape_json(es->str, objtype);
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ appendStringInfoSpaces(es->str, 2 * es->indent);
+ if (labelname)
+ {
+ appendStringInfo(es->str, "%s:", labelname);
+ }
+ appendStringInfo(es->str, "%s\n", objtype);
+ break;
}
}
@@ -1716,6 +1767,7 @@
switch (es->format)
{
case EXPLAIN_FORMAT_TEXT:
+ case EXPLAIN_FORMAT_YAML:
/* nothing to do */
break;
@@ -1756,6 +1808,10 @@
appendStringInfoString(es->str, "\n]");
es->grouping_stack = list_delete_first(es->grouping_stack);
break;
+
+ case EXPLAIN_FORMAT_YAML:
+ es->indent--;
+ break;
}
}
@@ -1773,6 +1829,7 @@
break;
case EXPLAIN_FORMAT_XML:
+ case EXPLAIN_FORMAT_YAML:
/* nothing to do */
break;
@@ -1874,3 +1931,31 @@
}
appendStringInfoCharMacro(buf, '\"');
}
+
+/*
+ * YAML is a superset of JSON: if we find quotable characters, we call escape_json
+ */
+static void
+escape_yaml(StringInfo buf, const char *str)
+{
+ const char *p;
+
+ for (p = str; *p; p++)
+ {
+ if ('"' == *p
+ || '\\' == *p
+ || '\t' == *p
+ || '\n' == *p
+ || '\r' == *p
+ || '\b' == *p
+ || '\f' == *p
+ || (unsigned char) *p < ' '
+ )
+ {
+ escape_json(buf, str);
+ return;
+ }
+ }
+
+ appendStringInfo(buf, "%s", str);
+}
Index: src/include/commands/explain.h
===================================================================
RCS file: /projects/cvsroot/pgsql/src/include/commands/explain.h,v
retrieving revision 1.41
diff -u -r1.41 explain.h
--- src/include/commands/explain.h 10 Aug 2009 05:46:50 -0000 1.41
+++ src/include/commands/explain.h 28 Aug 2009 18:12:50 -0000
@@ -19,7 +19,8 @@
{
EXPLAIN_FORMAT_TEXT,
EXPLAIN_FORMAT_XML,
- EXPLAIN_FORMAT_JSON
+ EXPLAIN_FORMAT_JSON,
+ EXPLAIN_FORMAT_YAML
} ExplainFormat;
typedef struct ExplainState
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