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diff --git a/src/include/utils/guc_tables.h b/src/include/utils/guc_tables.h
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+++ b/src/include/utils/guc_tables.h
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+/*-------------------------------------------------------------------------
+ *
+ * guc_tables.h
+ *		Declarations of tables used by GUC.
+ *
+ * See src/backend/utils/misc/README for design notes.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ *
+ *	  src/include/utils/guc_tables.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef GUC_TABLES_H
+#define GUC_TABLES_H 1
+
+#include "utils/guc.h"
+
+/*
+ * GUC supports these types of variables:
+ */
+enum config_type
+{
+	PGC_BOOL,
+	PGC_INT,
+	PGC_REAL,
+	PGC_STRING,
+	PGC_ENUM
+};
+
+union config_var_val
+{
+	bool		boolval;
+	int			intval;
+	double		realval;
+	char	   *stringval;
+	int			enumval;
+};
+
+/*
+ * The actual value of a GUC variable can include a malloc'd opaque struct
+ * "extra", which is created by its check_hook and used by its assign_hook.
+ */
+typedef struct config_var_value
+{
+	union config_var_val val;
+	void	   *extra;
+} config_var_value;
+
+/*
+ * Groupings to help organize all the run-time options for display.
+ * Be sure this agrees with the way the options are categorized in config.sgml!
+ */
+enum config_group
+{
+	UNGROUPED,					/* use for options not shown in pg_settings */
+	FILE_LOCATIONS,
+	CONN_AUTH_SETTINGS,
+	CONN_AUTH_AUTH,
+	CONN_AUTH_SSL,
+	RESOURCES_MEM,
+	RESOURCES_DISK,
+	RESOURCES_KERNEL,
+	RESOURCES_VACUUM_DELAY,
+	RESOURCES_BGWRITER,
+	RESOURCES_ASYNCHRONOUS,
+	WAL_SETTINGS,
+	WAL_CHECKPOINTS,
+	WAL_ARCHIVING,
+	WAL_ARCHIVE_RECOVERY,
+	WAL_RECOVERY_TARGET,
+	REPLICATION_SENDING,
+	REPLICATION_PRIMARY,
+	REPLICATION_STANDBY,
+	REPLICATION_SUBSCRIBERS,
+	QUERY_TUNING_METHOD,
+	QUERY_TUNING_COST,
+	QUERY_TUNING_GEQO,
+	QUERY_TUNING_OTHER,
+	LOGGING_WHERE,
+	LOGGING_WHEN,
+	LOGGING_WHAT,
+	PROCESS_TITLE,
+	STATS_MONITORING,
+	STATS_COLLECTOR,
+	AUTOVACUUM,
+	CLIENT_CONN_STATEMENT,
+	CLIENT_CONN_LOCALE,
+	CLIENT_CONN_PRELOAD,
+	CLIENT_CONN_OTHER,
+	LOCK_MANAGEMENT,
+	COMPAT_OPTIONS_PREVIOUS,
+	COMPAT_OPTIONS_CLIENT,
+	ERROR_HANDLING_OPTIONS,
+	PRESET_OPTIONS,
+	CUSTOM_OPTIONS,
+	DEVELOPER_OPTIONS
+};
+
+/*
+ * Stack entry for saving the state a variable had prior to an uncommitted
+ * transactional change
+ */
+typedef enum
+{
+	/* This is almost GucAction, but we need a fourth state for SET+LOCAL */
+	GUC_SAVE,					/* entry caused by function SET option */
+	GUC_SET,					/* entry caused by plain SET command */
+	GUC_LOCAL,					/* entry caused by SET LOCAL command */
+	GUC_SET_LOCAL				/* entry caused by SET then SET LOCAL */
+} GucStackState;
+
+typedef struct guc_stack
+{
+	struct guc_stack *prev;		/* previous stack item, if any */
+	int			nest_level;		/* nesting depth at which we made entry */
+	GucStackState state;		/* see enum above */
+	GucSource	source;			/* source of the prior value */
+	/* masked value's source must be PGC_S_SESSION, so no need to store it */
+	GucContext	scontext;		/* context that set the prior value */
+	GucContext	masked_scontext;	/* context that set the masked value */
+	config_var_value prior;		/* previous value of variable */
+	config_var_value masked;	/* SET value in a GUC_SET_LOCAL entry */
+} GucStack;
+
+/*
+ * Generic fields applicable to all types of variables
+ *
+ * The short description should be less than 80 chars in length. Some
+ * applications may use the long description as well, and will append
+ * it to the short description. (separated by a newline or '. ')
+ *
+ * Note that sourcefile/sourceline are kept here, and not pushed into stacked
+ * values, although in principle they belong with some stacked value if the
+ * active value is session- or transaction-local.  This is to avoid bloating
+ * stack entries.  We know they are only relevant when source == PGC_S_FILE.
+ */
+struct config_generic
+{
+	/* constant fields, must be set correctly in initial value: */
+	const char *name;			/* name of variable - MUST BE FIRST */
+	GucContext	context;		/* context required to set the variable */
+	enum config_group group;	/* to help organize variables by function */
+	const char *short_desc;		/* short desc. of this variable's purpose */
+	const char *long_desc;		/* long desc. of this variable's purpose */
+	int			flags;			/* flag bits, see guc.h */
+	/* variable fields, initialized at runtime: */
+	enum config_type vartype;	/* type of variable (set only at startup) */
+	int			status;			/* status bits, see below */
+	GucSource	source;			/* source of the current actual value */
+	GucSource	reset_source;	/* source of the reset_value */
+	GucContext	scontext;		/* context that set the current value */
+	GucContext	reset_scontext; /* context that set the reset value */
+	GucStack   *stack;			/* stacked prior values */
+	void	   *extra;			/* "extra" pointer for current actual value */
+	char	   *last_reported;	/* if variable is GUC_REPORT, value last sent
+								 * to client (NULL if not yet sent) */
+	char	   *sourcefile;		/* file current setting is from (NULL if not
+								 * set in config file) */
+	int			sourceline;		/* line in source file */
+};
+
+/* bit values in status field */
+#define GUC_IS_IN_FILE		0x0001	/* found it in config file */
+/*
+ * Caution: the GUC_IS_IN_FILE bit is transient state for ProcessConfigFile.
+ * Do not assume that its value represents useful information elsewhere.
+ */
+#define GUC_PENDING_RESTART 0x0002	/* changed value cannot be applied yet */
+#define GUC_NEEDS_REPORT	0x0004	/* new value must be reported to client */
+
+
+/* GUC records for specific variable types */
+
+struct config_bool
+{
+	struct config_generic gen;
+	/* constant fields, must be set correctly in initial value: */
+	bool	   *variable;
+	bool		boot_val;
+	GucBoolCheckHook check_hook;
+	GucBoolAssignHook assign_hook;
+	GucShowHook show_hook;
+	/* variable fields, initialized at runtime: */
+	bool		reset_val;
+	void	   *reset_extra;
+};
+
+struct config_int
+{
+	struct config_generic gen;
+	/* constant fields, must be set correctly in initial value: */
+	int		   *variable;
+	int			boot_val;
+	int			min;
+	int			max;
+	GucIntCheckHook check_hook;
+	GucIntAssignHook assign_hook;
+	GucShowHook show_hook;
+	/* variable fields, initialized at runtime: */
+	int			reset_val;
+	void	   *reset_extra;
+};
+
+struct config_real
+{
+	struct config_generic gen;
+	/* constant fields, must be set correctly in initial value: */
+	double	   *variable;
+	double		boot_val;
+	double		min;
+	double		max;
+	GucRealCheckHook check_hook;
+	GucRealAssignHook assign_hook;
+	GucShowHook show_hook;
+	/* variable fields, initialized at runtime: */
+	double		reset_val;
+	void	   *reset_extra;
+};
+
+struct config_string
+{
+	struct config_generic gen;
+	/* constant fields, must be set correctly in initial value: */
+	char	  **variable;
+	const char *boot_val;
+	GucStringCheckHook check_hook;
+	GucStringAssignHook assign_hook;
+	GucShowHook show_hook;
+	/* variable fields, initialized at runtime: */
+	char	   *reset_val;
+	void	   *reset_extra;
+};
+
+struct config_enum
+{
+	struct config_generic gen;
+	/* constant fields, must be set correctly in initial value: */
+	int		   *variable;
+	int			boot_val;
+	const struct config_enum_entry *options;
+	GucEnumCheckHook check_hook;
+	GucEnumAssignHook assign_hook;
+	GucShowHook show_hook;
+	/* variable fields, initialized at runtime: */
+	int			reset_val;
+	void	   *reset_extra;
+};
+
+/* constant tables corresponding to enums above and in guc.h */
+extern const char *const config_group_names[];
+extern const char *const config_type_names[];
+extern const char *const GucContext_Names[];
+extern const char *const GucSource_Names[];
+
+/* get the current set of variables */
+extern struct config_generic **get_guc_variables(void);
+
+extern void build_guc_variables(void);
+
+/* search in enum options */
+extern const char *config_enum_lookup_by_value(struct config_enum *record, int val);
+extern bool config_enum_lookup_by_name(struct config_enum *record,
+									   const char *value, int *retval);
+extern struct config_generic **get_explain_guc_options(int *num);
+
+#endif							/* GUC_TABLES_H */