Rearrange explain.c's API so callers need not embed sizeof(ExplainState).
The folly of the previous arrangement was just demonstrated: there's no convenient way to add fields to ExplainState without breaking ABI, even if callers have no need to touch those fields. Since we might well need to do that again someday in back branches, let's change things so that only explain.c has to have sizeof(ExplainState) compiled into it. This costs one extra palloc() per EXPLAIN operation, which is surely pretty negligible.
This commit is contained in:
Tom Lane
parent
a5cd70dcbc
commit
8e166e164c
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@ -294,32 +294,31 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
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msec = queryDesc->totaltime->total * 1000.0;
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if (msec >= auto_explain_log_min_duration)
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{
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ExplainState es;
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ExplainState *es = NewExplainState();
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ExplainInitState(&es);
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es.analyze = (queryDesc->instrument_options && auto_explain_log_analyze);
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es.verbose = auto_explain_log_verbose;
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es.buffers = (es.analyze && auto_explain_log_buffers);
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es.timing = (es.analyze && auto_explain_log_timing);
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es.summary = es.analyze;
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es.format = auto_explain_log_format;
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es->analyze = (queryDesc->instrument_options && auto_explain_log_analyze);
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es->verbose = auto_explain_log_verbose;
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es->buffers = (es->analyze && auto_explain_log_buffers);
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es->timing = (es->analyze && auto_explain_log_timing);
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es->summary = es->analyze;
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es->format = auto_explain_log_format;
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ExplainBeginOutput(&es);
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ExplainQueryText(&es, queryDesc);
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ExplainPrintPlan(&es, queryDesc);
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if (es.analyze && auto_explain_log_triggers)
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ExplainPrintTriggers(&es, queryDesc);
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ExplainEndOutput(&es);
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ExplainBeginOutput(es);
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ExplainQueryText(es, queryDesc);
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ExplainPrintPlan(es, queryDesc);
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if (es->analyze && auto_explain_log_triggers)
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ExplainPrintTriggers(es, queryDesc);
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ExplainEndOutput(es);
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/* Remove last line break */
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if (es.str->len > 0 && es.str->data[es.str->len - 1] == '\n')
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es.str->data[--es.str->len] = '\0';
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if (es->str->len > 0 && es->str->data[es->str->len - 1] == '\n')
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es->str->data[--es->str->len] = '\0';
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/* Fix JSON to output an object */
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if (auto_explain_log_format == EXPLAIN_FORMAT_JSON)
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{
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es.str->data[0] = '{';
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es.str->data[es.str->len - 1] = '}';
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es->str->data[0] = '{';
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es->str->data[es->str->len - 1] = '}';
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}
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/*
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@ -330,10 +329,10 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
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*/
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ereport(LOG,
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(errmsg("duration: %.3f ms plan:\n%s",
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msec, es.str->data),
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msec, es->str->data),
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errhidestmt(true)));
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pfree(es.str->data);
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pfree(es->str->data);
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}
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}
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@ -125,45 +125,42 @@ void
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ExplainQuery(ExplainStmt *stmt, const char *queryString,
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ParamListInfo params, DestReceiver *dest)
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{
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ExplainState es;
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ExplainState *es = NewExplainState();
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TupOutputState *tstate;
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List *rewritten;
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ListCell *lc;
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bool timing_set = false;
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/* Initialize ExplainState. */
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ExplainInitState(&es);
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/* Parse options list. */
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foreach(lc, stmt->options)
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{
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DefElem *opt = (DefElem *) lfirst(lc);
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if (strcmp(opt->defname, "analyze") == 0)
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es.analyze = defGetBoolean(opt);
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es->analyze = defGetBoolean(opt);
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else if (strcmp(opt->defname, "verbose") == 0)
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es.verbose = defGetBoolean(opt);
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es->verbose = defGetBoolean(opt);
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else if (strcmp(opt->defname, "costs") == 0)
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es.costs = defGetBoolean(opt);
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es->costs = defGetBoolean(opt);
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else if (strcmp(opt->defname, "buffers") == 0)
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es.buffers = defGetBoolean(opt);
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es->buffers = defGetBoolean(opt);
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else if (strcmp(opt->defname, "timing") == 0)
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{
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timing_set = true;
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es.timing = defGetBoolean(opt);
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es->timing = defGetBoolean(opt);
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}
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else if (strcmp(opt->defname, "format") == 0)
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{
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char *p = defGetString(opt);
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if (strcmp(p, "text") == 0)
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es.format = EXPLAIN_FORMAT_TEXT;
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es->format = EXPLAIN_FORMAT_TEXT;
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else if (strcmp(p, "xml") == 0)
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es.format = EXPLAIN_FORMAT_XML;
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es->format = EXPLAIN_FORMAT_XML;
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else if (strcmp(p, "json") == 0)
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es.format = EXPLAIN_FORMAT_JSON;
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es->format = EXPLAIN_FORMAT_JSON;
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else if (strcmp(p, "yaml") == 0)
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es.format = EXPLAIN_FORMAT_YAML;
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es->format = EXPLAIN_FORMAT_YAML;
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else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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@ -177,22 +174,22 @@ ExplainQuery(ExplainStmt *stmt, const char *queryString,
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opt->defname)));
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}
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if (es.buffers && !es.analyze)
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if (es->buffers && !es->analyze)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("EXPLAIN option BUFFERS requires ANALYZE")));
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/* if the timing was not set explicitly, set default value */
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es.timing = (timing_set) ? es.timing : es.analyze;
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es->timing = (timing_set) ? es->timing : es->analyze;
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/* check that timing is used with EXPLAIN ANALYZE */
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if (es.timing && !es.analyze)
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if (es->timing && !es->analyze)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("EXPLAIN option TIMING requires ANALYZE")));
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/* currently, summary option is not exposed to users; just set it */
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es.summary = es.analyze;
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es->summary = es->analyze;
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/*
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* Parse analysis was done already, but we still have to run the rule
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@ -210,7 +207,7 @@ ExplainQuery(ExplainStmt *stmt, const char *queryString,
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rewritten = QueryRewrite((Query *) copyObject(stmt->query));
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/* emit opening boilerplate */
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ExplainBeginOutput(&es);
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ExplainBeginOutput(es);
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if (rewritten == NIL)
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{
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@ -218,8 +215,8 @@ ExplainQuery(ExplainStmt *stmt, const char *queryString,
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* In the case of an INSTEAD NOTHING, tell at least that. But in
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* non-text format, the output is delimited, so this isn't necessary.
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*/
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if (es.format == EXPLAIN_FORMAT_TEXT)
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appendStringInfoString(es.str, "Query rewrites to nothing\n");
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if (es->format == EXPLAIN_FORMAT_TEXT)
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appendStringInfoString(es->str, "Query rewrites to nothing\n");
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}
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else
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{
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@ -228,41 +225,44 @@ ExplainQuery(ExplainStmt *stmt, const char *queryString,
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/* Explain every plan */
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foreach(l, rewritten)
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{
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ExplainOneQuery((Query *) lfirst(l), NULL, &es,
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ExplainOneQuery((Query *) lfirst(l), NULL, es,
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queryString, params);
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/* Separate plans with an appropriate separator */
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if (lnext(l) != NULL)
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ExplainSeparatePlans(&es);
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ExplainSeparatePlans(es);
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}
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}
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/* emit closing boilerplate */
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ExplainEndOutput(&es);
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Assert(es.indent == 0);
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ExplainEndOutput(es);
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Assert(es->indent == 0);
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/* output tuples */
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tstate = begin_tup_output_tupdesc(dest, ExplainResultDesc(stmt));
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if (es.format == EXPLAIN_FORMAT_TEXT)
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do_text_output_multiline(tstate, es.str->data);
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if (es->format == EXPLAIN_FORMAT_TEXT)
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do_text_output_multiline(tstate, es->str->data);
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else
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do_text_output_oneline(tstate, es.str->data);
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do_text_output_oneline(tstate, es->str->data);
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end_tup_output(tstate);
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pfree(es.str->data);
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pfree(es->str->data);
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}
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/*
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* Initialize ExplainState.
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* Create a new ExplainState struct initialized with default options.
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*/
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void
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ExplainInitState(ExplainState *es)
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ExplainState *
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NewExplainState(void)
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{
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/* Set default options. */
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memset(es, 0, sizeof(ExplainState));
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ExplainState *es = (ExplainState *) palloc0(sizeof(ExplainState));
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/* Set default options (most fields can be left as zeroes). */
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es->costs = true;
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/* Prepare output buffer. */
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es->str = makeStringInfo();
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return es;
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}
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/*
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@ -60,7 +60,7 @@ extern PGDLLIMPORT explain_get_index_name_hook_type explain_get_index_name_hook;
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extern void ExplainQuery(ExplainStmt *stmt, const char *queryString,
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ParamListInfo params, DestReceiver *dest);
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extern void ExplainInitState(ExplainState *es);
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extern ExplainState *NewExplainState(void);
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extern TupleDesc ExplainResultDesc(ExplainStmt *stmt);
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