fix: add alter table stmt

src/parser/common/entityCollector.ts

@@ -17,6 +17,7 @@ export enum StmtContextType {
     SELECT_STMT = 'selectStmt',
     INSERT_STMT = 'insertStmt',
     CREATE_FUNCTION_STMT = 'createFunctionStmt',
+    ALTER_TABLE_STMT = 'alterTableStmt',
 }
 
 export interface StmtContext {

src/parser/postgresql/postgreEntityCollector.ts

@@ -1,4 +1,5 @@
 import type {
+    AltertablestmtContext,
     ColumnCreateTableContext,
     ColumnNameCreateContext,
     CreateDatabaseContext,
@@ -145,4 +146,10 @@ export class PostgreSqlEntityCollector extends EntityCollector implements Postgr
     exitCreatefunctionstmt(ctx: CreatefunctionstmtContext) {
         this.popStmt();
     }
+    enterAltertablestmt(ctx: AltertablestmtContext) {
+        this.pushStmt(ctx, StmtContextType.ALTER_TABLE_STMT);
+    }
+    exitAltertablestmt(ctx: AltertablestmtContext) {
+        this.popStmt();
+    }
 }

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

@@ -8,4 +8,6 @@ INSERT INTO insert_tb SELECT id, age,  FROM from_tb;
 
 CREATE TABLE sorted_census_data AS SELECT  FROM unsorted_census_data;
 
-CREATE TABLE sorted_census_data AS SELECT id, age,  FROM unsorted_census_data;
+CREATE TABLE sorted_census_data AS SELECT id, age,  FROM unsorted_census_data;
+
+ALTER TABLE my_table DROP a_column;

test/parser/postgresql/suggestion/suggestionWithEntity.test.ts

@@ -153,4 +153,25 @@ describe('PostgreSql Syntax Suggestion with collect entity', () => {
         expect(entities[1].entityContextType).toBe(EntityContextType.TABLE);
         expect(entities[1].belongStmt.isContainCaret).toBeTruthy();
     });
+
+    test('alter table drop column', () => {
+        const pos: CaretPosition = {
+            lineNumber: 13,
+            column: 35,
+        };
+        const sql = commentOtherLine(syntaxSql, pos.lineNumber);
+
+        const syntaxes = postgre.getSuggestionAtCaretPosition(sql, pos)?.syntax;
+        const suggestion = syntaxes?.find(
+            (syn) => syn.syntaxContextType === EntityContextType.COLUMN
+        );
+        expect(suggestion).not.toBeUndefined();
+        expect(suggestion?.wordRanges.map((token) => token.text)).toEqual(['a_column']);
+
+        const entities = postgre.getAllEntities(sql, pos);
+        expect(entities.length).toBe(1);
+        expect(entities[0].text).toBe('my_table');
+        expect(entities[0].entityContextType).toBe(EntityContextType.TABLE);
+        expect(entities[0].belongStmt?.isContainCaret).toBeTruthy();
+    });
 });