fix: #301 pgsql truncate table suggestion (#302)

src/grammar/postgresql/PostgreSqlParser.g4

@@ -5556,7 +5556,6 @@ plsql_unreserved_keyword
     | KW_SLICE
     | KW_SQLSTATE
     | KW_STACKED
-    | KW_TABLE
     //| TABLE_NAME
     | KW_TYPE
     | KW_USE_COLUMN

test/parser/postgresql/suggestion/fixtures/syntaxSuggestion.sql

@@ -75,3 +75,7 @@ UPDATE tablename SET columnname = a + b, (col1, col2) = (a+3, b+4);
 VACUUM tablename (col1, col2);
 
 SELECT * FROM db.tbs GROUP BY (col1, col2) ORDER BY col3;
+
+TRUNCATE TABLE ;
+
+TRUNCATE TABLE t1;

test/parser/postgresql/suggestion/syntaxSuggestion.test.ts

@@ -970,4 +970,36 @@ describe('Postgre SQL Syntax Suggestion', () => {
         expect(suggestion3).not.toBeUndefined();
         expect(suggestion3?.wordRanges.map((token) => token.text)).toEqual(['col3']);
     });
+
+    test('TRUNCATE TABLE', () => {
+        const pos1: CaretPosition = {
+            lineNumber: 79,
+            column: 16,
+        };
+        const pos2: CaretPosition = {
+            lineNumber: 81,
+            column: 18,
+        };
+
+        const syntaxes1 = postgresql.getSuggestionAtCaretPosition(
+            commentOtherLine(syntaxSql, pos1.lineNumber),
+            pos1
+        )?.syntax;
+        const syntaxes2 = postgresql.getSuggestionAtCaretPosition(
+            commentOtherLine(syntaxSql, pos2.lineNumber),
+            pos2
+        )?.syntax;
+
+        const suggestion1 = syntaxes1?.find(
+            (syn) => syn.syntaxContextType === EntityContextType.TABLE
+        );
+        const suggestion2 = syntaxes2?.find(
+            (syn) => syn.syntaxContextType === EntityContextType.TABLE
+        );
+
+        expect(suggestion1).not.toBeUndefined();
+        expect(suggestion1?.wordRanges.map((token) => token.text)).toEqual([]);
+        expect(suggestion2).not.toBeUndefined();
+        expect(suggestion2?.wordRanges.map((token) => token.text)).toEqual(['t1']);
+    });
 });