内部函数

GaussDB中下列函数使用了内部数据类型，用户无法直接调用，在此章节列出。

• 选择率计算函数

  areajoinsel	areasel	arraycontjoinsel	arraycontsel	contjoinsel	contsel	eqjoinsel
  eqsel	iclikejoinsel	iclikesel	icnlikejoinsel	icnlikesel	icregexeqjoinsel	icregexeqsel
  icregexnejoinsel	icregexnesel	likejoinsel	likesel	neqjoinsel	neqsel	nlikejoinsel
  nlikesel	positionjoinsel	positionsel	regexeqjoinsel	regexeqsel	regexnejoinsel	regexnesel
  scalargtjoinsel	scalargtsel	scalarltjoinsel	scalarltsel	tsmatchjoinsel	tsmatchsel	-

• 统计信息收集函数

  array_typanalyze	range_typanalyze	ts_typanalyze
  local_rto_stat	remote_rto_stat	-

• 排序内部功能函数

  bpchar_sortsupport

  bytea_sortsupport

  date_sortsupport

  numeric_sortsupport

  timestamp_sortsupport

• 内部类型处理函数

  abstimerecv	euc_jis_2004_to_utf8	int2recv	line_recv	oidvectorrecv_extend	tidrecv	utf8_to_koi8u
  anyarray_recv	euc_jp_to_mic	int2vectorrecv	lseg_recv	path_recv	time_recv	utf8_to_shift_jis_2004
  array_recv	euc_jp_to_sjis	int4recv	macaddr_recv	pg_node_tree_recv	time_transform	utf8_to_sjis
  ascii_to_mic	euc_jp_to_utf8	int8recv	mic_to_ascii	point_recv	timestamp_recv	utf8_to_uhc
  ascii_to_utf8	euc_kr_to_mic	internal_out	mic_to_big5	poly_recv	timestamp_transform	utf8_to_win
  big5_to_euc_tw	euc_kr_to_utf8	interval_recv	mic_to_euc_cn	pound_nexttoken	timestamptz_recv	uuid_recv
  big5_to_mic	euc_tw_to_big5	interval_transform	mic_to_euc_jp	prsd_nexttoken	timetz_recv	varbit_recv
  big5_to_utf8	euc_tw_to_mic	iso_to_koi8r	mic_to_euc_kr	range_recv	tintervalrecv	varbit_transform
  bit_recv	euc_tw_to_utf8	iso_to_mic	mic_to_euc_tw	rawrecv	tsqueryrecv	varchar_transform
  boolrecv	float4recv	iso_to_win1251	mic_to_iso	record_recv	tsvectorrecv	varcharrecv
  box_recv	float8recv	iso_to_win866	mic_to_koi8r	regclassrecv	txid_snapshot_recv	void_recv
  bpcharrecv	gb18030_to_utf8	iso8859_1_to_utf8	mic_to_latin1	regconfigrecv	uhc_to_utf8	win_to_utf8
  btoidsortsupport	gbk_to_utf8	iso8859_to_utf8	mic_to_latin2	regdictionaryrecv	unknownrecv	win1250_to_latin2
  bytearecv	gin_extract_tsvector	johab_to_utf8	mic_to_latin3	regoperatorrecv	utf8_to_ascii	win1250_to_mic
  byteawithoutorderwithequalcolrecv	gtsvector_compress	json_recv	mic_to_latin4	regoperrecv	utf8_to_big5	win1251_to_iso
  cash_recv	gtsvector_consistent	koi8r_to_iso	mic_to_sjis	regprocedurerecv	utf8_to_euc_cn	win1251_to_koi8r
  charrecv	gtsvector_decompress	koi8r_to_mic	mic_to_win1250	regprocrecv	utf8_to_euc_jis_2004	win1251_to_mic
  cidr_recv	gtsvector_penalty	koi8r_to_utf8	mic_to_win1251	regtyperecv	utf8_to_euc_jp	win1251_to_win866
  cidrecv	gtsvector_picksplit	koi8r_to_win1251	mic_to_win866	reltimerecv	utf8_to_euc_kr	win866_to_iso
  circle_recv	gtsvector_same	koi8r_to_win866	namerecv	shift_jis_2004_to_euc_jis_2004	utf8_to_euc_tw	win866_to_koi8r
  cstring_recv	gtsvector_union	koi8u_to_utf8	ngram_nexttoken	shift_jis_2004_to_utf8	utf8_to_gb18030	win866_to_mic
  date_recv	hll_recv	latin1_to_mic	numeric_recv	sjis_to_euc_jp	utf8_to_gbk	win866_to_win1251
  domain_recv	hll_trans_recv	latin2_to_mic	numeric_transform	sjis_to_mic	utf8_to_iso8859	xidrecv
  euc_cn_to_mic	large_seq_upgrade_ntree	latin2_to_win1250	nvarchar2recv	sjis_to_utf8	utf8_to_iso8859_1	xidrecv4
  euc_cn_to_utf8	inet_recv	latin3_to_mic	oidrecv	smalldatetime_recv	utf8_to_johab	xml_recv
  euc_jis_2004_to_shift_jis_2004	int1recv	latin4_to_mic	oidvectorrecv	textrecv	utf8_to_koi8r	cstore_tid_out
  numeric_bool	int2vectorin_extend	int2vectorout_extend	int2vectorrecv_extend	int2vectorsend_extend	int8_accum	large_seq_rollback_ntree
  i16toi1	int16eq	int16ge	int16gt	int16in	int16le	int16lt
  int16mi	int16mul	int16ne	int16out	int16pl	int16recv	int16send
  int16_bool	-	-	-	-	-	-

• 聚合操作内部函数

  array_agg_finalfn	array_agg_transfn	bytea_string_agg_finalfn	bytea_string_agg_transfn	date_list_agg_noarg2_transfn	date_list_agg_transfn	float4_list_agg_noarg2_transfn
  float4_list_agg_transfn	float8_list_agg_noarg2_transfn	float8_list_agg_transfn	int2_list_agg_noarg2_transfn	int2_list_agg_transfn	int4_list_agg_noarg2_transfn	int4_list_agg_transfn
  int8_list_agg_noarg2_transfn	int8_list_agg_transfn	interval_list_agg_noarg2_transfn	interval_list_agg_transfn	list_agg_finalfn	list_agg_noarg2_transfn	list_agg_transfn
  median	median_float8_finalfn	median_interval_finalfn	median_transfn	mode_final	numeric_list_agg_noarg2_transfn	numeric_list_agg_transfn
  ordered_set_transition	percentile_cont_float8_final	percentile_cont_interval_final	string_agg_finalfn	string_agg_transfn	timestamp_list_agg_noarg2_transfn	timestamp_list_agg_transfn
  timestamptz_list_agg_noarg2_transfn	timestamptz_list_agg_transfn	checksumtext_agg_transfn	json_agg_transfn	json_agg_finalfn	json_object_agg_transfn	json_object_agg_finalfn

• 哈希内部功能函数

  hashbeginscan	hashbuild	hashbuildempty	hashbulkdelete	hashcostestimate	hashendscan	hashgetbitmap
  hashgettuple	hashinsert	hashmarkpos	hashmerge	hashrescan	hashrestrpos	hashvacuumcleanup
  hashvarlena	jsonb_hash	-	-	-	-	-

• Btree索引内部功能函数

  cbtreebuild	cbtreecanreturn	cbtreecostestimate	cbtreegetbitmap	cbtreegettuple	btbeginscan	btbuild
  btbuildempty	btbulkdelete	btcanreturn	btcostestimate	btendscan	btfloat4sortsupport	btfloat8sortsupport
  btgetbitmap	btgettuple	btinsert	btint2sortsupport	btint4sortsupport	btint8sortsupport	btmarkpos
  btmerge	btnamesortsupport	btrescan	btrestrpos	bttextsortsupport	btvacuumcleanup	cbtreeoptions

• Psort索引内部函数

  psortbuild

  psortcanreturn

  psortcostestimate

  psortgetbitmap

  psortgettuple

• Ubtree索引内部函数

  ubtbeginscan	ubtbuild	ubtbuildempty	ubtbulkdelete	ubtcanreturn
  ubtcostestimate	ubtendscan	ubtgetbitmap	ubtgettuple	ubtinsert
  ubtmarkpos	ubtmerge	ubtoptions	ubtrescan	ubtrestrpos
  ubtvacuumcleanup	-	-	-	-

• plpgsql内部函数

  plpgsql_inline_handler

• 外表相关内部函数

  dist_fdw_handler	roach_handler	streaming_fdw_handler	dist_fdw_validator	file_fdw_handler	file_fdw_validator	log_fdw_handler
  gc_fdw_handler	gc_fdw_validator	-	-	-	-	-

• 数据倾斜优化相关内部函数

  distributed_count

• 表统计信息相关内部函数

  pgxc_get_stat_dirty_tables

  pgxc_stat_dirty_tables

  get_global_stat_all_tables

  get_summary_stat_all_tables

• 远程读取数据函数

  gs_read_block_from_remote 用于读取非段页式表文件的页面。默认只有初始化用户可以查看，其余用户需要赋权后才可以使用。

  gs_read_segment_block_from_remote 用于读取段页式表文件的页面。默认只有初始化用户可以查看，其余用户需要赋权后才可以使用。

• 远程读取文件函数

  gs_read_file_size_from_remote 用于读取指定文件的大小，gs_repair_file函数修复文件时，要先获取远端关于这个文件的大小，用于校验本地文件缺失的文件信息，然后将缺失的文件逐个修复。默认只有初始化用户可以查看，其余用户需要赋权后才可以使用。

  gs_read_file_from_remote 用于读取指定的文件，gs_repair_file利用gs_read_file_size_from_remote函数获取文件大小后，依赖这个函数将远端文件逐段读取。默认只有初始化用户可以查看，其余用户需要赋权后才可以使用。

• 视图相关引用函数

  adm_hist_sqlstat_func

  adm_hist_sqlstat_idlog_func