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/*------------------------------------------------------------------------- * * execdesc.h * plan and query descriptor accessor macros used by the executor * and related modules. * * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/executor/execdesc.h * *------------------------------------------------------------------------- */ #ifndef EXECDESC_H #define EXECDESC_H #include "nodes/execnodes.h" #include "tcop/dest.h" /* ---------------- * query descriptor: * * a QueryDesc encapsulates everything that the executor * needs to execute the query. * * For the convenience of SQL-language functions, we also support QueryDescs * containing utility statements; these must not be passed to the executor * however. * --------------------- */ typedef struct QueryDesc { /* These fields are provided by CreateQueryDesc */ CmdType operation; /* CMD_SELECT, CMD_UPDATE, etc. */ PlannedStmt *plannedstmt; /* planner's output, or null if utility */ Node *utilitystmt; /* utility statement, or null */ const char *sourceText; /* source text of the query */ Snapshot snapshot; /* snapshot to use for query */ Snapshot crosscheck_snapshot; /* crosscheck for RI update/delete */ DestReceiver *dest; /* the destination for tuple output */ ParamListInfo params; /* param values being passed in */ int instrument_options; /* OR of InstrumentOption flags */ /* These fields are set by ExecutorStart */ TupleDesc tupDesc; /* descriptor for result tuples */ EState *estate; /* executor's query-wide state */ PlanState *planstate; /* tree of per-plan-node state */ /* This is always set NULL by the core system, but plugins can change it */ struct Instrumentation *totaltime; /* total time spent in ExecutorRun */ } QueryDesc; /* in pquery.c */ extern QueryDesc *CreateQueryDesc(PlannedStmt *plannedstmt, const char *sourceText, Snapshot snapshot, Snapshot crosscheck_snapshot, DestReceiver *dest, ParamListInfo params, int instrument_options); extern QueryDesc *CreateUtilityQueryDesc(Node *utilitystmt, const char *sourceText, Snapshot snapshot, DestReceiver *dest, ParamListInfo params); extern void FreeQueryDesc(QueryDesc *qdesc); #endif /* EXECDESC_H */