expression-pushed-down: Link to internal string/misc/cast functions (#…

…18206)

functions-and-operators/expressions-pushed-down.md

@@ -21,11 +21,11 @@ TiFlash also supports pushdown for the functions and operators [listed on this p
 | [Control flow functions](/functions-and-operators/control-flow-functions.md) | [CASE](https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html#operator_case) <br/>[IF()](https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html#function_if) <br/>[IFNULL()](https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html#function_ifnull) |
 | [JSON functions](/functions-and-operators/json-functions.md) | [JSON_ARRAY_APPEND()](/functions-and-operators/json-functions/json-functions-modify.md#json_array_append) <br/>[JSON_ARRAY()](/functions-and-operators/json-functions/json-functions-create.md#json_array) <br/>[JSON_CONTAINS()](/functions-and-operators/json-functions/json-functions-search.md#json_contains) <br/>[JSON_EXTRACT()](/functions-and-operators/json-functions/json-functions-search.md#json_extract) <br/>[JSON_INSERT()](/functions-and-operators/json-functions/json-functions-modify.md#json_insert) <br/>[JSON_LENGTH()](/functions-and-operators/json-functions/json-functions-return.md#json_length) <br/>[JSON_MERGE_PATCH()](/functions-and-operators/json-functions/json-functions-modify.md#json_merge_patch) <br/>[JSON_MERGE()](/functions-and-operators/json-functions/json-functions-modify.md#json_merge) <br/>[JSON_OBJECT()](/functions-and-operators/json-functions/json-functions-create.md#json_object) <br/>[JSON_REMOVE()](/functions-and-operators/json-functions/json-functions-modify.md#json_remove) <br/>[JSON_REPLACE()](/functions-and-operators/json-functions/json-functions-modify.md#json_replace) <br/>[JSON_SET()](/functions-and-operators/json-functions/json-functions-modify.md#json_set) <br/>[JSON_TYPE()](/functions-and-operators/json-functions/json-functions-return.md#json_type) <br/>[JSON_UNQUOTE()](/functions-and-operators/json-functions/json-functions-modify.md#json_unquote) <br/>[JSON_VALID()](/functions-and-operators/json-functions/json-functions-return.md#json_valid) <br/>[MEMBER OF()](/functions-and-operators/json-functions/json-functions-search.md#member-of) |
 | [Date and time functions](/functions-and-operators/date-and-time-functions.md) | [DATE()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date) <br/>[DATE_FORMAT()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-format) <br/>[DATEDIFF()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_datediff) <br/>[DAYOFMONTH()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_dayofmonth) <br/>[DAYOFWEEK()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_dayofweek) <br/>[DAYOFYEAR()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_dayofyear) <br/>[FROM_DAYS()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_from-days) <br/>[HOUR()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_hour) <br/>[MAKEDATE()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_makedate) <br/>[MAKETIME()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_maketime) <br/>[MICROSECOND()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_microsecond) <br/>[MINUTE()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_minute) <br/>[MONTH()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_month) <br/>[MONTHNAME()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_monthname) <br/>[PERIOD_ADD()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_period-add) <br/>[PERIOD_DIFF()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_period-diff) <br/>[SEC_TO_TIME()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_sec-to-time) <br/>[SECOND()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_second) <br/>[SYSDATE()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_sysdate) <br/>[TIME_TO_SEC()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_time-to-sec) <br/>[TIMEDIFF()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_timediff) <br/>[WEEK()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_week) <br/>[WEEKOFYEAR()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_weekofyear) <br/>[YEAR()](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_year) |
-| [String functions](/functions-and-operators/string-functions.md) | [ASCII()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ascii) <br/>[BIT_LENGTH()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_bit-length) <br/>[CHAR()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_char) <br/>[CHAR_LENGTH()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_char-length) <br/>[CONCAT()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat) <br/>[CONCAT_WS()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat-ws) <br/>[ELT()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_elt) <br/>[FIELD()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_field) <br/>[HEX()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_hex) <br/>[LENGTH()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_length) <br/>[LIKE](https://dev.mysql.com/doc/refman/8.0/en/string-comparison-functions.html#operator_like) <br/>[LOWER()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_lower) <br/>[LTRIM()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ltrim) <br/>[MID()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_mid) <br/>[NOT LIKE](https://dev.mysql.com/doc/refman/8.0/en/string-comparison-functions.html#operator_not-like) <br/>[NOT REGEXP](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#operator_not-regexp) <br/>[REGEXP](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#operator_regexp) <br/>[REGEXP_INSTR()](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-instr) <br/>[REGEXP_LIKE()](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-like) <br/>[REGEXP_REPLACE()](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-replace) <br/>[REGEXP_SUBSTR()](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-substr) <br/>[REPLACE()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_replace) <br/>[REVERSE()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_reverse) <br/>[RIGHT()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_right), [RLIKE](https://dev.mysql.com/doc/refman/8.0/en/regexp.html#operator_regexp) <br/>[RTRIM()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_rtrim) <br/>[SPACE()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_space) <br/>[STRCMP()](https://dev.mysql.com/doc/refman/8.0/en/string-comparison-functions.html#function_strcmp) <br/>[SUBSTR()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substr) <br/>[SUBSTRING()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring) <br/>[UPPER()](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_upper) |
+| [String functions](/functions-and-operators/string-functions.md) | [ASCII()](/functions-and-operators/string-functions.md#ascii) <br/>[BIT_LENGTH()](/functions-and-operators/string-functions.md#bit_length) <br/>[CHAR()](/functions-and-operators/string-functions.md#char) <br/>[CHAR_LENGTH()](/functions-and-operators/string-functions.md#char_length) <br/>[CONCAT()](/functions-and-operators/string-functions.md#concat) <br/>[CONCAT_WS()](/functions-and-operators/string-functions.md#concat_ws) <br/>[ELT()](/functions-and-operators/string-functions.md#elt) <br/>[FIELD()](/functions-and-operators/string-functions.md#field) <br/>[HEX()](/functions-and-operators/string-functions.md#hex) <br/>[LENGTH()](/functions-and-operators/string-functions.md#length) <br/>[LIKE](/functions-and-operators/string-functions.md#like) <br/>[LOWER()](/functions-and-operators/string-functions.md#lower) <br/>[LTRIM()](/functions-and-operators/string-functions.md#ltrim) <br/>[MID()](/functions-and-operators/string-functions.md#mid) <br/>[NOT LIKE](/functions-and-operators/string-functions.md#not-like) <br/>[NOT REGEXP](/functions-and-operators/string-functions.md#not-regexp) <br/>[REGEXP](/functions-and-operators/string-functions.md#regexp) <br/>[REGEXP_LIKE()](/functions-and-operators/string-functions.md#regexp_like) <br/>[REGEXP_REPLACE()](/functions-and-operators/string-functions.md#regexp_replace) <br/>[REGEXP_SUBSTR()](/functions-and-operators/string-functions.md#regexp_substr) <br/>[REPLACE()](/functions-and-operators/string-functions.md#replace) <br/>[REVERSE()](/functions-and-operators/string-functions.md#reverse) <br/>[RIGHT()](/functions-and-operators/string-functions.md#right), [RLIKE](/functions-and-operators/string-functions.md#rlike) <br/>[RTRIM()](/functions-and-operators/string-functions.md#rtrim) <br/>[SPACE()](/functions-and-operators/string-functions.md#space) <br/>[STRCMP()](/functions-and-operators/string-functions.md#strcmp) <br/>[SUBSTR()](/functions-and-operators/string-functions.md#substr) <br/>[SUBSTRING()](/functions-and-operators/string-functions.md#substring) <br/>[UPPER()](/functions-and-operators/string-functions.md#upper) |
 | [Aggregation functions](/functions-and-operators/aggregate-group-by-functions.md#aggregate-group-by-functions) | [COUNT()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_count) <br/>[COUNT(DISTINCT)](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_count-distinct) <br/>[SUM()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_sum) <br/>[AVG()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_avg) <br/>[MAX()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_max) <br/>[MIN()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_min) <br/>[VARIANCE()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_variance) <br/>[VAR_POP()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_var-pop) <br/>[STD()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_std) <br/>[STDDEV()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_stddev) <br/>[STDDEV_POP](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_stddev-pop) <br/>[VAR_SAMP()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_var-samp) <br/>[STDDEV_SAMP()](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_stddev-samp) <br/>[JSON_ARRAYAGG(key)](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_json-arrayagg) <br/>[JSON_OBJECTAGG(key, value)](https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_json-objectagg) |
 | [Encryption and compression functions](/functions-and-operators/encryption-and-compression-functions.md#encryption-and-compression-functions) | [MD5()](https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_md5) <br/>[SHA1(), SHA()](https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_sha1) <br/>[UNCOMPRESSED_LENGTH()](https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_uncompressed-length) |
-| [Cast functions and operators](/functions-and-operators/cast-functions-and-operators.md#cast-functions-and-operators) | [CAST()](https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html#function_cast) <br/>[CONVERT()](https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html#function_convert) |
-| [Miscellaneous functions](/functions-and-operators/miscellaneous-functions.md#supported-functions) | [UUID()](https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_uuid) |
+| [Cast functions and operators](/functions-and-operators/cast-functions-and-operators.md#cast-functions-and-operators) | [CAST()](/functions-and-operators/cast-functions-and-operators.md#cast) <br/>[CONVERT()](/functions-and-operators/cast-functions-and-operators.md#convert) |
+| [Miscellaneous functions](/functions-and-operators/miscellaneous-functions.md#supported-functions) | [UUID()](/functions-and-operators/miscellaneous-functions.md#uuid) |
 
 ## Blocklist specific expressions