Failed to parse MySQL statement and add common index statement with alter

[t291436520]

Failed to parse MySQL statement and add common index statement with alter

Version：

com.github.jsqlparser
jsqlparser
4.1

Parsed statement ：
ALTER TABLE table_name8 ADD index (column_1)
This statement can be executed normally in the database。

Error info :
`
net.sf.jsqlparser.JSQLParserException: Encountered unexpected token: "(" "("
at line 1, column 35.

Was expecting one of:

"COMMENT"

at net.sf.jsqlparser.parser.CCJSqlParserUtil.parseStatements(CCJSqlParserUtil.java:215)
at net.sf.jsqlparser.parser.CCJSqlParserUtil.parseStatements(CCJSqlParserUtil.java:203)
at com.holder.cdc.database.dynamicSql.utils.MysqlDdl2PgDdlUtils.convert(MysqlDdl2PgDdlUtils.java:24)
at com.holder.cdc.database.dynamicSql.utils.MysqlDdl2PgDdlUtils.lambda$main$5(MysqlDdl2PgDdlUtils.java:195)
at java.util.ArrayList.forEach(ArrayList.java:1259)
at com.holder.cdc.database.dynamicSql.utils.MysqlDdl2PgDdlUtils.main(MysqlDdl2PgDdlUtils.java:192)

Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "(" "("
at line 1, column 35.

Was expecting one of:

"COMMENT"

at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:26917)
at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:26753)
at net.sf.jsqlparser.parser.CCJSqlParser.AlterExpression(CCJSqlParser.java:15418)
at net.sf.jsqlparser.parser.CCJSqlParser.AlterTable(CCJSqlParser.java:15646)
at net.sf.jsqlparser.parser.CCJSqlParser.SingleStatement(CCJSqlParser.java:190)
at net.sf.jsqlparser.parser.CCJSqlParser.Statements(CCJSqlParser.java:547)
at net.sf.jsqlparser.parser.CCJSqlParserUtil.parseStatements(CCJSqlParserUtil.java:213)
... 5 more

`

Excuse me, is this the problem I use？

[manticore-projects]

Greetings.

This particular syntax

ALTER TABLE table_name8 ADD index (column_1)

is unsupported.

Standard compliant syntax

ALTER TABLE table_name8 ADD PRIMARY KEY (column_1)

will work.

[wumpz]

Unnamed indexes are not allowed but named are:

ALTER TABLE table_name8 ADD index myidx (column_1)