Modify column with "NULL" or "NOT NULL" is not getting parsed.

[VaibhavJain]

Actual Behavior

On parsing statement ALTER TABLE MODIFY NOT NULL getting ParseException

`Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "NOT" "NOT "" at line 1, column 51.
Was expecting one of:
"XML" ...
"INTERVAL" ...
"CHARACTER" ...
"BIT" ...
<K_DATETIMELITERAL> ...
"DOUBLE" ...
<DT_ZONE> ...
<S_IDENTIFIER> ...

at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:16869)
at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:16722)
at net.sf.jsqlparser.parser.CCJSqlParser.ColDataType(CCJSqlParser.java:9265)
at net.sf.jsqlparser.parser.CCJSqlParser.AlterExpressionColumnDataType(CCJSqlParser.java:9862)
at net.sf.jsqlparser.parser.CCJSqlParser.AlterExpression(CCJSqlParser.java:10042)
at net.sf.jsqlparser.parser.CCJSqlParser.AlterTable(CCJSqlParser.java:10279)
at net.sf.jsqlparser.parser.CCJSqlParser.SingleStatement(CCJSqlParser.java:156)
at net.sf.jsqlparser.parser.CCJSqlParser.Statement(CCJSqlParser.java:81)
at net.sf.jsqlparser.parser.CCJSqlParserUtil.parse(CCJSqlParserUtil.java:54) `

Expected Behavior

It should identify "NOT NULL"/"NULL" has been added.

Steps to Reproduce the Problem

1.Statement stmt = CCJSqlParserUtil.parse("ALTER TABLE TableName MODIFY ColumnName NOT NULL");

Specifications

• Version: 1.1
• Platform: Java 8 on windows
• Subsystem:

[wumpz]

As far as I know is the modify command not supported (yet). Do you want to provide a PR with an initial start supporting this?

[yarnping]

@VaibhavJain what kind of db related to this sql statement?

[manticore-projects]

Still relevant with JSQLParser 4.3 Snapshot.