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
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- 统计信息收集函数
array_typanalyze
range_typanalyze
ts_typanalyze
local_rto_stat
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- 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
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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
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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
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i16toi1
int16
int16_bool
int16eq
int16div
int16ge
int16gt
int16in
int16le
int16lt
int16mi
int16mul
int16ne
int16out
int16pl
int16recv
int16send
numeric_bool
int2vectorin_extend
int2vectorout_extend
int2vectorrecv_extend
int2vectorsend_extend
tdigest_in
tdigest_merge
tdigest_merge_to_one
tdigest_mergep
tdigest_out
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anyset_out
btint2setcmp
btint4setcmp
btint8setcmp
btsetcmp
btsetint2cmp
btsetint4cmp
btsetint8cmp
btsetsortsupport
float4
float8
hashsetint
hashsettext
int2
int2seteq
int2setge
int2setgt
int2setle
int2setlt
int2setne
int4
int4seteq
int4setge
int4setgt
int4setle
int4setlt
int4setne
int8
int8seteq
int8setge
int8setgt
int8setle
int8setlt
int8setne
set
set_in
set_out
set_recv
set_send
seteq
setge
setgt
setint2eq
setint2ge
setint2gt
setint2le
setint2lt
setint2ne
setint4eq
setint4ge
setint4gt
setint4le
setint4lt
setint4ne
setint8eq
setint8ge
setint8gt
setint8le
setint8lt
setint8ne
setle
setlt
setne
settexteq
settextge
settextgt
settextle
settextlt
settextne
settobpchar
settonumber
settonvarchar2
settotext
settovarchar
textseteq
textsetge
textsetgt
textsetle
textsetlt
textsetne
gb18030_2022_to_utf8
utf8_to_gb18030_2022
array_to_nesttable
array_to_indexby_int_table
- 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_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
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- 哈希内部功能函数
hashbeginscan
hashbuild
hashbuildempty
hashbulkdelete
hashcostestimate
hashendscan
hashgetbitmap
hashgettuple
hashinsert
hashmarkpos
hashmerge
hashrescan
hashrestrpos
hashvacuumcleanup
hashvarlena
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- 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
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- plpgsql内部函数
- 集合相关内部函数
array_indexby_delete
array_indexby_length
array_integer_deleteidx
array_integer_exists
array_integer_first
array_integer_last
array_integer_next
array_integer_prior
array_varchar_deleteidx
array_varchar_exists
array_varchar_first
array_varchar_last
array_varchar_next
array_varchar_prior
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- 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
dblink_fdw_handler
dblink_fdw_validator
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- 主DN远程读取备DN数据页辅助函数
gs_read_block_from_remote用于读取表文件的页面。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。
- 主DN远程读取备DN数据文件辅助函数
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。
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。
- 以备DN增量重建其他备或级联备DN辅助函数
gs_standby_incremental_filemap_create用于创建备DN增量重建临时filemap文件，用于存储当次增量重建需传输的数据路径与大小。只有初始化用户且application为gs_rewind时可以调用。
gs_standby_incremental_filemap_insert用于向指定临时filemap文件中插入文件信息，指定文件的路径、传输起始点、单次传输数据长度和rebuild标志位。只有初始化用户且application为gs_rewind时可以调用。
gs_standby_incremental_filemap_execute用于获取指定临时filemap文件中存储的文件信息并删除指定filemap，用于备DN增量重建的数据传输。只有初始化用户且application为gs_rewind时可以调用。
- AI特性函数
create_snapshot
create_snapshot_internal
prepare_snapshot_internal
prepare_snapshot
manage_snapshot_internal
archive_snapshot
publish_snapshot
purge_snapshot_internal
purge_snapshot
sample_snapshot
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- PKG_SERVICE函数
isubmit_on_nodes
submit_on_nodes
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- 其他函数
to_tsvector_for_batch
value_of_percentile
disable_conn
bind_variable
job_update
job_cancel
job_finish
similar_escape
table_skewness （不可用）
timetz_text
time_text
reltime_text
abstime_text
_pg_keysequal
analyze_query
(不可用）
analyze_workload （不可用）
ssign_table_type
gs_comm_proxy_thread_status
gs_txid_oldestxmin
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pg_stat_segment_space_info
remote_segment_space_info
set_cost_params
set_weight_params
start_collect_workload
tdigest_in
tdigest_merge
tdigest_merge_to_one
tdigest_mergep
tdigest_out
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- 视图相关引用函数
adm_hist_sqlstat_idlog_func
adm_hist_sqltext_func
- gs_txn_snapshot系统表维护函数
gs_insert_delete_txn_snapshot用于GTM-Lite模式下维护全局各节点gs_txn_snapshot系统表，只有系统管理员用户才能调用，当前版本调用该函数将返回f，无实际操作。
- xmltype类型相关函数
