Fix VECTOR(n) columns rendering as JSON hyperlinks in results grid (#21835)

VECTOR values like [0.1,2,30] are valid JSON arrays, so the per-cell
JSON detection in getColumnFormatter was marking them as isJson=true and
rendering them blue/clickable. Add isVector to IDbColumn (populated from
DbColumnWrapper.IsVector in sqltoolsservice) and use it in
getColumnFormatter to return textFormatter directly, bypassing the
XML/JSON sampling path entirely.

Fixes: #21806

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kburtram

extensions/mssql/src/models/interfaces.ts

@@ -126,6 +126,7 @@ export interface IDbColumn {
     dataType: string;
     isXml?: boolean;
     isJson?: boolean;
+    isVector?: boolean;
     isLong?: boolean;
     isReadOnly?: boolean;
     isUnique?: boolean;

extensions/mssql/src/sharedInterfaces/queryResult.ts

@@ -173,6 +173,7 @@ export interface IDbColumn {
     dataType: string;
     isXml?: boolean;
     isJson?: boolean;
+    isVector?: boolean;
     isLong?: boolean;
     isReadOnly?: boolean;
     isUnique?: boolean;

extensions/mssql/src/webviews/pages/QueryResult/resultGrid.tsx

@@ -362,6 +362,12 @@ function getColumnFormatter(columnInfo: qr.IDbColumn): (
         return hyperLinkFormatter;
     }
 
+    // VECTOR columns display as plain text. Their [n,n,n] format looks like a JSON array
+    // but must never be formatted as a JSON hyperlink or opened in the JSON viewer.
+    if (columnInfo.isVector) {
+        return textFormatter;
+    }
+
     // Avoid expensive XML/JSON parsing on every cell render for plain-text columns.
     // Track which rows we've already sampled so SlickGrid re-renders don't
     // exhaust the budget.

extensions/mssql/typings/vscode-mssql.d.ts

@@ -2708,6 +2708,7 @@ declare module "vscode-mssql" {
         dataType: string;
         isXml?: boolean;
         isJson?: boolean;
+        isVector?: boolean;
         isLong?: boolean;
         isReadOnly?: boolean;
         isUnique?: boolean;