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SQL Expressions: Allow more MySQL AST node-types (#102973)

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* SQL Expressions: Add Null-literal node

* Retain some order in the code - put NullVal with BoolVal

* Add support for `IN` keyword

* Add GROUP_CONCAT keyword

* Add COLLATE keyword

From Claude:

The test case demonstrates a simple use of COLLATE with a string
literal, but in real MySQL queries, COLLATE is often used in more
complex scenarios like:

1. String comparisons:
   `SELECT * FROM table WHERE name COLLATE utf8mb4_bin = 'John'`
2. Sorting:
   `SELECT * FROM table ORDER BY name COLLATE utf8mb4_unicode_ci`
3. JOINs:
   `SELECT * FROM table1 JOIN table2 ON table1.name COLLATE utf8mb4_bin = table2.name`

The COLLATE clause is particularly useful when you need case-sensitive
comparisons (utf8mb4_bin) or specific language-aware sorting rules.
This commit is contained in:
Sam Jewell
2025-03-27 11:32:48 +00:00
committed by GitHub
parent e1e1d3fd9f
commit c9e929e2e6
2 changed files with 33 additions and 1 deletions
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14
pkg/expr/sql/parser_allow.go
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@ -60,7 +60,7 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
case *sqlparser.BinaryExpr, *sqlparser.UnaryExpr:
return
case sqlparser.BoolVal:
case sqlparser.BoolVal, *sqlparser.NullVal:
return
case *sqlparser.CaseExpr, *sqlparser.When:
@ -81,6 +81,15 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
case *sqlparser.ConvertExpr, *sqlparser.ConvertType:
return
case *sqlparser.CollateExpr:
return
case sqlparser.Exprs:
return
case *sqlparser.GroupConcatExpr:
return
case sqlparser.GroupBy:
return
@ -132,6 +141,9 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
case *sqlparser.TrimExpr:
return
case sqlparser.ValTuple:
return
case *sqlparser.With:
return