Allow InjectedExpr to handle name resolution

Author: Hydrocharged

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/dolthub/go-icu-regex v0.0.0-20230524105445-af7e7991c97e
 	github.com/dolthub/jsonpath v0.0.2-0.20240201003050-392940944c15
 	github.com/dolthub/sqllogictest/go v0.0.0-20201107003712-816f3ae12d81
-	github.com/dolthub/vitess v0.0.0-20240207220624-0c2d2128fb7b
+	github.com/dolthub/vitess v0.0.0-20240209125211-6c93b0341608
 	github.com/go-kit/kit v0.10.0
 	github.com/go-sql-driver/mysql v1.7.2-0.20231213112541-0004702b931d
 	github.com/gocraft/dbr/v2 v2.7.2

go.sum

@@ -58,8 +58,8 @@ github.com/dolthub/jsonpath v0.0.2-0.20240201003050-392940944c15 h1:sfTETOpsrNJP
 github.com/dolthub/jsonpath v0.0.2-0.20240201003050-392940944c15/go.mod h1:2/2zjLQ/JOOSbbSboojeg+cAwcRV0fDLzIiWch/lhqI=
 github.com/dolthub/sqllogictest/go v0.0.0-20201107003712-816f3ae12d81 h1:7/v8q9XGFa6q5Ap4Z/OhNkAMBaK5YeuEzwJt+NZdhiE=
 github.com/dolthub/sqllogictest/go v0.0.0-20201107003712-816f3ae12d81/go.mod h1:siLfyv2c92W1eN/R4QqG/+RjjX5W2+gCTRjZxBjI3TY=
-github.com/dolthub/vitess v0.0.0-20240207220624-0c2d2128fb7b h1:7Sxjtwd7Cm2ilQDFvyXPfCkNkJMK//2GBGb3aM9ht7k=
-github.com/dolthub/vitess v0.0.0-20240207220624-0c2d2128fb7b/go.mod h1:IwjNXSQPymrja5pVqmfnYdcy7Uv7eNJNBPK/MEh9OOw=
+github.com/dolthub/vitess v0.0.0-20240209125211-6c93b0341608 h1:jnInva1KcJJf/QQsxbN9tTJckOZf73EzUen8rrik0Yw=
+github.com/dolthub/vitess v0.0.0-20240209125211-6c93b0341608/go.mod h1:IwjNXSQPymrja5pVqmfnYdcy7Uv7eNJNBPK/MEh9OOw=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=

sql/planbuilder/scalar.go

@@ -243,10 +243,18 @@ func (b *Builder) buildScalar(inScope *scope, e ast.Expr) (ex sql.Expression) {
 		}
 		return ret
 	case ast.InjectedExpr:
-		if expr, ok := v.Expression.(sql.Expression); ok {
-			return expr
+		resolvedChildren := make([]any, len(v.Children))
+		for i, child := range v.Children {
+			resolvedChildren[i] = b.buildScalar(inScope, child)
 		}
-		b.handleErr(fmt.Errorf("Injected expression is not a valid expression"))
+		expr, err := v.Expression.WithResolvedChildren(resolvedChildren)
+		if err != nil {
+			b.handleErr(err)
+		}
+		if sqlExpr, ok := expr.(sql.Expression); ok {
+			return sqlExpr
+		}
+		b.handleErr(fmt.Errorf("Injected expression does not resolve to a valid expression"))
 		return nil
 	case *ast.RangeCond:
 		val := b.buildScalar(inScope, v.Left)