Handle IF EMPTY syntax in DROP TABLE/DATABASE statements

Parse the IF EMPTY modifier in addition to IF EXISTS for DROP statements.

Author: claude

parser/parser.go

@@ -4755,12 +4755,15 @@ func (p *Parser) parseDrop() *ast.DropQuery {
 		}
 	}
 
-	// Handle IF EXISTS
+	// Handle IF EXISTS or IF EMPTY
 	if p.currentIs(token.IF) {
 		p.nextToken()
 		if p.currentIs(token.EXISTS) {
 			drop.IfExists = true
 			p.nextToken()
+		} else if p.currentIs(token.IDENT) && strings.ToUpper(p.current.Value) == "EMPTY" {
+			// IF EMPTY - skip the EMPTY keyword
+			p.nextToken()
 		}
 	}
 

parser/testdata/02716_drop_if_empty/metadata.json

@@ -1,7 +1 @@
-{
-  "explain_todo": {
-    "stmt10": true,
-    "stmt11": true,
-    "stmt13": true
-  }
-}
+{}