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Filename : explain.h
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/*-------------------------------------------------------------------------
 *
 * explain.h
 *	  prototypes for explain.c
 *
 * Portions Copyright (c) 1996-2012, 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"

typedef enum ExplainFormat
{
	EXPLAIN_FORMAT_TEXT,
	EXPLAIN_FORMAT_XML,
	EXPLAIN_FORMAT_JSON,
	EXPLAIN_FORMAT_YAML
} ExplainFormat;

typedef struct ExplainState
{
	StringInfo	str;			/* output buffer */
	/* options */
	bool		verbose;		/* be verbose */
	bool		analyze;		/* print actual times */
	bool		costs;			/* print costs */
	bool		buffers;		/* print buffer usage */
	bool		timing;			/* print timing */
	ExplainFormat format;		/* output format */
	/* other states */
	PlannedStmt *pstmt;			/* top of plan */
	List	   *rtable;			/* range table */
	int			indent;			/* current indentation level */
	List	   *grouping_stack; /* format-specific grouping state */
} ExplainState;

/* Hook for plugins to get control in ExplainOneQuery() */
typedef void (*ExplainOneQuery_hook_type) (Query *query,
													   IntoClause *into,
													   ExplainState *es,
													 const char *queryString,
													   ParamListInfo params);
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(ExplainStmt *stmt, const char *queryString,
			 ParamListInfo params, DestReceiver *dest);

extern void ExplainInitState(ExplainState *es);

extern TupleDesc ExplainResultDesc(ExplainStmt *stmt);

extern void ExplainOneUtility(Node *utilityStmt, IntoClause *into,
				  ExplainState *es,
				  const char *queryString, ParamListInfo params);

extern void ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into,
			   ExplainState *es,
			   const char *queryString, ParamListInfo params);

extern void ExplainPrintPlan(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 ExplainPropertyText(const char *qlabel, const char *value,
					ExplainState *es);
extern void ExplainPropertyInteger(const char *qlabel, int value,
					   ExplainState *es);
extern void ExplainPropertyLong(const char *qlabel, long value,
					ExplainState *es);
extern void ExplainPropertyFloat(const char *qlabel, double value, int ndigits,
					 ExplainState *es);

#endif   /* EXPLAIN_H */