Table created with non-nullable column even without `NOT NULL` in column definition

[tsegismont]

When using the MS SQL Client for CREATE TABLE statements, the resulting columns are non-nullable even when NOT NULL is not specified on the column definition.

This does not happen when using the JDBC client on the same database.

PreparedStatement create = conn.prepareStatement("create table Basic (id int, dessimal numeric(19,2), primary key (id))");
create.executeUpdate();
PreparedStatement insert = conn.prepareStatement("INSERT INTO Basic (id, dessimal) values (3, ?)");
insert.setBigDecimal(1, new BigDecimal("3.2"));
insert.executeUpdate();

The snippet above works fine but this one fails:

connnection.preparedQuery("create table Basic2 (id int, dessimal numeric(19,2), primary key (id))")
  .execute(ctx.asyncAssertSuccess(create -> {
    connnection.preparedQuery("INSERT INTO Basic2 (id, dessimal) values (3, @p1)")
      .execute(Tuple.of(NullValue.BigDecimal), ctx.asyncAssertSuccess());
  }));

The error message is:

io.vertx.mssqlclient.MSSQLException: {number=515, state=2, severity=16, message='Cannot insert the value NULL into column 'dessimal', table 'master.dbo.Basic2'; column does not allow nulls. INSERT fails.', serverName='0ac9600ef0bb', lineNumber=1}

As a workaround, the column definition must explicitly allow NULL values:

create table Basic2 (id int, dessimal numeric(19,2) null, primary key (id))