lexer.nextToken();
if (lexer.token() == Token.COLUMN) {
lexer.nextToken();
}
SQLAlterTableAlterColumn alterColumn = new SQLAlterTableAlterColumn();
SQLColumnDefinition columnDef = this.exprParser.parseColumn();
alterColumn.setColumn(columnDef);
stmt.getItems().add(alterColumn);
} else if (identifierEquals("CHANGE")) {
lexer.nextToken();
if (lexer.token() == Token.COLUMN) {