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Don't duplicate planning logic in citus' explain hook. 

Instead use pg_plan_query() like the normal explain does, and use that
to explain the query.  That's important because it allows to remove
the duplicated planner logic from multi_explain - and that logic is
about to get more complicated.
pull/1146/head
Andres Freund 2017-01-19 15:09:13 -08:00
parent 0f28a11970
commit 608bed0387
1 changed files with 43 additions and 66 deletions
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109
src/backend/distributed/planner/multi_explain.c
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@ -77,6 +77,9 @@ static void ExplainTask(Task *task, int placementIndex, List *explainOutputList,
static void ExplainTaskPlacement(ShardPlacement *taskPlacement, List *explainOutputList,
ExplainState *es);
static StringInfo BuildRemoteExplainQuery(char *queryString, ExplainState *es);
static void MultiExplainOnePlan(PlannedStmt *plan, IntoClause *into,
ExplainState *es, const char *queryString,
ParamListInfo params, const instr_time *planDuration);
/* Static Explain functions copied from explain.c */
static void ExplainOpenGroup(const char *objtype, const char *labelname,
@ -98,17 +101,10 @@ void
MultiExplainOneQuery(Query *query, IntoClause *into, ExplainState *es,
const char *queryString, ParamListInfo params)
{
MultiPlan *multiPlan = NULL;
CmdType commandType = CMD_UNKNOWN;
PlannedStmt *initialPlan = NULL;
Job *workerJob = NULL;
bool routerExecutablePlan = false;
instr_time planStart;
instr_time planDuration;
Query *originalQuery = NULL;
RelationRestrictionContext *restrictionContext = NULL;
bool localQuery = !NeedsDistributedPlanning(query);
int cursorOptions = 0;
PlannedStmt *plan = NULL;
#if PG_VERSION_NUM >= 90600
@ -122,71 +118,54 @@ MultiExplainOneQuery(Query *query, IntoClause *into, ExplainState *es,
}
#endif
/* handle local queries in the same way as ExplainOneQuery */
if (localQuery)
{
PlannedStmt *plan = NULL;
INSTR_TIME_SET_CURRENT(planStart);
/* plan the query */
plan = pg_plan_query(query, cursorOptions, params);
INSTR_TIME_SET_CURRENT(planDuration);
INSTR_TIME_SUBTRACT(planDuration, planStart);
/* run it (if needed) and produce output */
ExplainOnePlan(plan, into, es, queryString, params, &planDuration);
return;
}
/*
* standard_planner scribbles on it's input, but for deparsing we need the
* unmodified form. So copy once we're sure it's a distributed query.
*/
originalQuery = copyObject(query);
/* measure the full planning time to display in EXPLAIN ANALYZE */
/* plan query, just like ExplainOneQuery does */
INSTR_TIME_SET_CURRENT(planStart);
restrictionContext = CreateAndPushRestrictionContext();
PG_TRY();
{
/* call standard planner to modify the query structure before multi planning */
initialPlan = standard_planner(query, cursorOptions, params);
commandType = initialPlan->commandType;
if (commandType == CMD_INSERT || commandType == CMD_UPDATE ||
commandType == CMD_DELETE)
{
if (es->analyze)
{
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Using ANALYZE for INSERT/UPDATE/DELETE on "
"distributed tables is not supported.")));
}
}
multiPlan = CreatePhysicalPlan(originalQuery, query, restrictionContext);
}
PG_CATCH();
{
PopRestrictionContext();
PG_RE_THROW();
}
PG_END_TRY();
PopRestrictionContext();
/* plan the query */
plan = pg_plan_query(query, cursorOptions, params);
INSTR_TIME_SET_CURRENT(planDuration);
INSTR_TIME_SUBTRACT(planDuration, planStart);
/* if not a distributed query, use plain explain infrastructure */
if (!HasCitusToplevelNode(plan))
{
/* run it (if needed) and produce output */
ExplainOnePlan(plan, into, es, queryString, params, &planDuration);
}
else
{
MultiExplainOnePlan(plan, into, es, queryString, params, &planDuration);
}
}
/*
* MultiExplainOnePlan explains the plan for an individual distributed query.
*/
static void
MultiExplainOnePlan(PlannedStmt *plan, IntoClause *into,
ExplainState *es, const char *queryString,
ParamListInfo params, const instr_time *planDuration)
{
MultiPlan *multiPlan = NULL;
CmdType commandType = CMD_UNKNOWN;
Job *workerJob = NULL;
bool routerExecutablePlan = false;
commandType = plan->commandType;
if (commandType == CMD_INSERT || commandType == CMD_UPDATE ||
commandType == CMD_DELETE)
{
if (es->analyze)
{
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Using ANALYZE for INSERT/UPDATE/DELETE on "
"distributed tables is not supported.")));
}
}
multiPlan = GetMultiPlan(plan);
if (!ExplainDistributedQueries)
{
@ -252,8 +231,6 @@ MultiExplainOneQuery(Query *query, IntoClause *into, ExplainState *es,
if (!routerExecutablePlan)
{
PlannedStmt *masterPlan = MultiQueryContainerNode(initialPlan, multiPlan);
if (es->format == EXPLAIN_FORMAT_TEXT)
{
appendStringInfoSpaces(es->str, es->indent * 2);
@ -263,7 +240,7 @@ MultiExplainOneQuery(Query *query, IntoClause *into, ExplainState *es,
ExplainOpenGroup("Master Query", "Master Query", false, es);
ExplainMasterPlan(masterPlan, into, es, queryString, params, &planDuration);
ExplainMasterPlan(plan, into, es, queryString, params, planDuration);
ExplainCloseGroup("Master Query", "Master Query", false, es);