1 files changed, 127 insertions, 0 deletions
diff --git a/src/include/commands/explain.h b/src/include/commands/explain.h
new file mode 100644
index 0000000..ba661d3
--- /dev/null
+++ b/src/include/commands/explain.h
@@ -0,0 +1,127 @@
+/*-------------------------------------------------------------------------
+ *
+ * explain.h
+ *	  prototypes for explain.c
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994-5, Regents of the University of California
+ *
+ * src/include/commands/explain.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef EXPLAIN_H
+#define EXPLAIN_H
+
+#include "executor/executor.h"
+#include "lib/stringinfo.h"
+#include "parser/parse_node.h"
+
+typedef enum ExplainFormat
+{
+	EXPLAIN_FORMAT_TEXT,
+	EXPLAIN_FORMAT_XML,
+	EXPLAIN_FORMAT_JSON,
+	EXPLAIN_FORMAT_YAML
+} ExplainFormat;
+
+typedef struct ExplainWorkersState
+{
+	int			num_workers;	/* # of worker processes the plan used */
+	bool	   *worker_inited;	/* per-worker state-initialized flags */
+	StringInfoData *worker_str; /* per-worker transient output buffers */
+	int		   *worker_state_save;	/* per-worker grouping state save areas */
+	StringInfo	prev_str;		/* saved output buffer while redirecting */
+} ExplainWorkersState;
+
+typedef struct ExplainState
+{
+	StringInfo	str;			/* output buffer */
+	/* options */
+	bool		verbose;		/* be verbose */
+	bool		analyze;		/* print actual times */
+	bool		costs;			/* print estimated costs */
+	bool		buffers;		/* print buffer usage */
+	bool		wal;			/* print WAL usage */
+	bool		timing;			/* print detailed node timing */
+	bool		summary;		/* print total planning and execution timing */
+	bool		settings;		/* print modified settings */
+	ExplainFormat format;		/* output format */
+	/* state for output formatting --- not reset for each new plan tree */
+	int			indent;			/* current indentation level */
+	List	   *grouping_stack; /* format-specific grouping state */
+	/* state related to the current plan tree (filled by ExplainPrintPlan) */
+	PlannedStmt *pstmt;			/* top of plan */
+	List	   *rtable;			/* range table */
+	List	   *rtable_names;	/* alias names for RTEs */
+	List	   *deparse_cxt;	/* context list for deparsing expressions */
+	Bitmapset  *printed_subplans;	/* ids of SubPlans we've printed */
+	bool		hide_workers;	/* set if we find an invisible Gather */
+	/* state related to the current plan node */
+	ExplainWorkersState *workers_state; /* needed if parallel plan */
+} ExplainState;
+
+/* Hook for plugins to get control in ExplainOneQuery() */
+typedef void (*ExplainOneQuery_hook_type) (Query *query,
+										   int cursorOptions,
+										   IntoClause *into,
+										   ExplainState *es,
+										   const char *queryString,
+										   ParamListInfo params,
+										   QueryEnvironment *queryEnv);
+extern PGDLLIMPORT ExplainOneQuery_hook_type ExplainOneQuery_hook;
+
+/* Hook for plugins to get control in explain_get_index_name() */
+typedef const char *(*explain_get_index_name_hook_type) (Oid indexId);
+extern PGDLLIMPORT explain_get_index_name_hook_type explain_get_index_name_hook;
+
+
+extern void ExplainQuery(ParseState *pstate, ExplainStmt *stmt,
+						 ParamListInfo params, DestReceiver *dest);
+
+extern ExplainState *NewExplainState(void);
+
+extern TupleDesc ExplainResultDesc(ExplainStmt *stmt);
+
+extern void ExplainOneUtility(Node *utilityStmt, IntoClause *into,
+							  ExplainState *es, const char *queryString,
+							  ParamListInfo params, QueryEnvironment *queryEnv);
+
+extern void ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into,
+						   ExplainState *es, const char *queryString,
+						   ParamListInfo params, QueryEnvironment *queryEnv,
+						   const instr_time *planduration,
+						   const BufferUsage *bufusage);
+
+extern void ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc);
+extern void ExplainPrintTriggers(ExplainState *es, QueryDesc *queryDesc);
+
+extern void ExplainPrintJITSummary(ExplainState *es, QueryDesc *queryDesc);
+
+extern void ExplainQueryText(ExplainState *es, QueryDesc *queryDesc);
+
+extern void ExplainBeginOutput(ExplainState *es);
+extern void ExplainEndOutput(ExplainState *es);
+extern void ExplainSeparatePlans(ExplainState *es);
+
+extern void ExplainPropertyList(const char *qlabel, List *data,
+								ExplainState *es);
+extern void ExplainPropertyListNested(const char *qlabel, List *data,
+									  ExplainState *es);
+extern void ExplainPropertyText(const char *qlabel, const char *value,
+								ExplainState *es);
+extern void ExplainPropertyInteger(const char *qlabel, const char *unit,
+								   int64 value, ExplainState *es);
+extern void ExplainPropertyUInteger(const char *qlabel, const char *unit,
+									uint64 value, ExplainState *es);
+extern void ExplainPropertyFloat(const char *qlabel, const char *unit,
+								 double value, int ndigits, ExplainState *es);
+extern void ExplainPropertyBool(const char *qlabel, bool value,
+								ExplainState *es);
+
+extern void ExplainOpenGroup(const char *objtype, const char *labelname,
+							 bool labeled, ExplainState *es);
+extern void ExplainCloseGroup(const char *objtype, const char *labelname,
+							  bool labeled, ExplainState *es);
+
+#endif							/* EXPLAIN_H */