Fix broken links (pingcap#6639)

dveeden · Oct 19, 2021 · 1714d77 · 1714d77
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diff --git a/blocklist-control-plan.md b/blocklist-control-plan.md
@@ -82,7 +82,7 @@ The blocklist of expression pushdown is one way to tune the expression pushdown,
 | [Logical operations](/functions-and-operators/operators.md#logical-operators) | AND (&&), OR (&#124;&#124;), NOT (!) |
 | [Comparison functions and operators](/functions-and-operators/operators.md#comparison-functions-and-operators) | <, <=, =, != (`<>`), >, >=, [`<=>`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_equal-to), [`IN()`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_in), IS NULL, LIKE, IS TRUE, IS FALSE, [`COALESCE()`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_coalesce) |
 | [Numeric functions and operators](/functions-and-operators/numeric-functions-and-operators.md) | +, -, *, /, [`ABS()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_abs), [`CEIL()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_ceil), [`CEILING()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_ceiling), [`FLOOR()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_floor) |
-| [Control flow functions](/functions-and-operators/control-flow-functions.md) | [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#operator_case), [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_if), [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_ifnull) |
+| [Control flow functions](/functions-and-operators/control-flow-functions.md) | [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#operator_case), [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_if), [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_ifnull) |
 | [JSON functions](/functions-and-operators/json-functions.md) | [JSON_TYPE(json_val)](https://dev.mysql.com/doc/refman/5.7/en/json-attribute-functions.html#function_json-type),<br/> [JSON_EXTRACT(json_doc, path[, path] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-extract),<br/> [JSON_UNQUOTE(json_val)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-unquote),<br/> [JSON_OBJECT(key, val[, key, val] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html#function_json-object),<br/> [JSON_ARRAY([val[, val] ...])](https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html#function_json-array),<br/> [JSON_MERGE(json_doc, json_doc[, json_doc] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge),<br/> [JSON_SET(json_doc, path, val[, path, val] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-set),<br/> [JSON_INSERT(json_doc, path, val[, path, val] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-insert),<br/> [JSON_REPLACE(json_doc, path, val[, path, val] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-replace),<br/> [JSON_REMOVE(json_doc, path[, path] ...)](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-remove) |
 | [Date and time functions](/functions-and-operators/date-and-time-functions.md) | [`DATE_FORMAT()`](https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format)  |
 

diff --git a/functions-and-operators/control-flow-functions.md b/functions-and-operators/control-flow-functions.md
@@ -6,11 +6,11 @@ aliases: ['/docs/dev/functions-and-operators/control-flow-functions/','/docs/dev
 
 # Control Flow Functions
 
-TiDB supports all of the [control flow functions](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html) available in MySQL 5.7.
+TiDB supports all of the [control flow functions](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html) available in MySQL 5.7.
 
 | Name                                                                                            | Description                       |
 |:--------------------------------------------------------------------------------------------------|:----------------------------------|
-| [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#operator_case)       | Case operator                     |
-| [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_if)         | If/else construct                 |
-| [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_ifnull) | Null if/else construct            |
-| [`NULLIF()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_nullif) | Return NULL if expr1 = expr2      |
+| [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#operator_case)       | Case operator                     |
+| [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_if)         | If/else construct                 |
+| [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_ifnull) | Null if/else construct            |
+| [`NULLIF()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_nullif) | Return NULL if expr1 = expr2      |
diff --git a/functions-and-operators/expressions-pushed-down.md b/functions-and-operators/expressions-pushed-down.md
@@ -15,7 +15,7 @@ When TiDB reads data from TiKV, TiDB tries to push down some expressions (includ
 | [Logical operators](/functions-and-operators/operators.md#logical-operators) | AND (&&), OR (&#124;&#124;), NOT (!) |
 | [Comparison functions and operators](/functions-and-operators/operators.md#comparison-functions-and-operators) | <, <=, =, != (`<>`), >, >=, [`<=>`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_equal-to), [`IN()`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_in), IS NULL, LIKE, IS TRUE, IS FALSE, [`COALESCE()`](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_coalesce) |
 | [Numeric functions and operators](/functions-and-operators/numeric-functions-and-operators.md) | +, -, *, /, [`ABS()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_abs), [`CEIL()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_ceil), [`CEILING()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_ceiling), [`FLOOR()`](https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_floor) |
-| [Control flow functions](/functions-and-operators/control-flow-functions.md) | [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#operator_case), [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_if), [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_ifnull) |
+| [Control flow functions](/functions-and-operators/control-flow-functions.md) | [`CASE`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#operator_case), [`IF()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_if), [`IFNULL()`](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#function_ifnull) |
 | [JSON functions](/functions-and-operators/json-functions.md) | [JSON_TYPE(json_val)][json_type],<br/> [JSON_EXTRACT(json_doc, path[, path] ...)][json_extract],<br/> [JSON_OBJECT(key, val[, key, val] ...)][json_object],<br/> [JSON_ARRAY([val[, val] ...])][json_array],<br/> [JSON_MERGE(json_doc, json_doc[, json_doc] ...)][json_merge],<br/> [JSON_SET(json_doc, path, val[, path, val] ...)][json_set],<br/> [JSON_INSERT(json_doc, path, val[, path, val] ...)][json_insert],<br/> [JSON_REPLACE(json_doc, path, val[, path, val] ...)][json_replace],<br/> [JSON_REMOVE(json_doc, path[, path] ...)][json_remove] |
 | [Date and time functions](/functions-and-operators/date-and-time-functions.md) | [`DATE_FORMAT()`](https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format)  |
 

diff --git a/functions-and-operators/operators.md b/functions-and-operators/operators.md
@@ -24,7 +24,7 @@ This document describes the operators precedence, comparison functions and opera
 | [~](https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html#operator_bitwise-invert) | Bitwise inversion |
 | [\|](https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html#operator_bitwise-or) | Bitwise OR |
 | [^](https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html#operator_bitwise-xor) | Bitwise XOR |
-| [CASE](https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#operator_case) | Case operator |
+| [CASE](https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html#operator_case) | Case operator |
 | [DIV](https://dev.mysql.com/doc/refman/5.7/en/arithmetic-functions.html#operator_div) | Integer division |
 | [/](https://dev.mysql.com/doc/refman/5.7/en/arithmetic-functions.html#operator_divide) | Division operator |
 | [=](https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_equal) | Equal operator |