fix(editor): 修复 MySQL DUAL、SYSDATE 提示和额外间距

apps/desktop/src/lib/sql/semantic/diagnostics.ts

@@ -15,6 +15,7 @@ export interface SqlSemanticDiagnosticSchema {
   missingTables?: Set<string>;
   loadedColumnTables?: Set<string>;
   sql?: string;
+  databaseType?: DatabaseType;
 }
 
 export interface SqlSemanticDiagnosticVisibleRange {
@@ -52,6 +53,7 @@ export function buildSqlSemanticDiagnostics(analysis: SqlReferenceAnalysis, sche
   }
 
   for (const table of tables) {
+    if (isSqlVirtualTableReference(table, schema.databaseType)) continue;
     if (!schema.missingTables?.has(tableReferenceKey(table))) continue;
     diagnostics.push({
       span: trimSqlTextSpanWhitespace(schema.sql, table.span),
@@ -82,6 +84,10 @@ export function buildSqlSemanticDiagnostics(analysis: SqlReferenceAnalysis, sche
   return diagnostics;
 }
 
+export function isSqlVirtualTableReference(table: { name: string; schema?: string | null }, databaseType?: DatabaseType): boolean {
+  return databaseType === "mysql" && !table.schema && normalizeName(table.name) === "dual";
+}
+
 function trimSqlTextSpanWhitespace(sql: string | undefined, span: SqlTextSpan): SqlTextSpan {
   if (!sql) return span;
   const range = sqlTextSpanToOffsetRange(sql, span);

apps/desktop/src/lib/sql/sqlCompletion.ts

@@ -958,6 +958,7 @@ const MYSQL_FUNCTION_SIGNATURES = new Map<string, string[]>([
   ["DATE_FORMAT", ["date", "format"]],
   ["FROM_UNIXTIME", ["unix_timestamp"]],
   ["UNIX_TIMESTAMP", []],
+  ["SYSDATE", []],
   ["JSON_EXTRACT", ["json", "path"]],
   ["JSON_UNQUOTE", ["json"]],
   ["GROUP_CONCAT", ["expression"]],