CLOBs can cause ClassCastExceptions #3701
Description
I have a file-based database that I sometimes connect to using the sqlline tool for diagnostic purposes. In that DB is a table containing CLOB typed columns:
0: jdbc:h2:/tmp/h2-db> !columns service
+-----------+-------------+------------+----------------------------------+-----------+------------------------+-------------+---------------+----------------+----------------+----------+---------+--+
| TABLE_CAT | TABLE_SCHEM | TABLE_NAME | COLUMN_NAME | DATA_TYPE | TYPE_NAME | COLUMN_SIZE | BUFFER_LENGTH | DECIMAL_DIGITS | NUM_PREC_RADIX | NULLABLE | REMARKS | |
+-----------+-------------+------------+----------------------------------+-----------+------------------------+-------------+---------------+----------------+----------------+----------+---------+--+
| H2-DB | PUBLIC | SERVICE | ID | 12 | CHARACTER VARYING | 36 | null | 0 | null | 0 | | |
| H2-DB | PUBLIC | SERVICE | NAME | 12 | CHARACTER VARYING | 63 | null | 0 | null | 0 | | |
...
| H2-DB | PUBLIC | SERVICE | ADDITIONAL_RESOURCES | 2005 | CHARACTER LARGE OBJECT | 2147483647 | null | 0 | null | 1 | | |
| H2-DB | PUBLIC | SERVICE | CONFIG_VALUES | 2005 | CHARACTER LARGE OBJECT | 2147483647 | null | 0 | null | 1 | | |
...
+-----------+-------------+------------+----------------------------------+-----------+------------------------+-------------+---------------+----------------+----------------+----------+---------+--+
When I try to select a result containing these columns, I get a ClassCastException:
0: jdbc:h2:/tmp/h2-db> select * from SERVICE;
java.lang.ClassCastException: class org.h2.value.lob.LobDataFetchOnDemand cannot be cast to class org.h2.value.lob.LobDataDatabase (org.h2.value.lob.LobDataFetchOnDemand and org.h2.value.lob.LobDataDatabase are in unnamed module of loader 'app')
at org.h2.value.ValueClob.getSQL(ValueClob.java:281)
at org.h2.util.HasSQL.getSQL(HasSQL.java:62)
at org.h2.util.HasSQL.getTraceSQL(HasSQL.java:50)
at org.h2.jdbc.JdbcLob.toString(JdbcLob.java:225)
at sqlline.Rows$Row.setFormat(Rows.java:313)
at sqlline.Rows$Row.<init>(Rows.java:282)
at sqlline.BufferedRows.nextList(BufferedRows.java:118)
at sqlline.BufferedRows.<init>(BufferedRows.java:54)
at sqlline.SqlLine.print(SqlLine.java:1770)
at sqlline.Commands.executeSingleQuery(Commands.java:1139)
at sqlline.Commands.execute(Commands.java:1079)
at sqlline.Commands.sql(Commands.java:1033)
at sqlline.SqlLine.dispatch(SqlLine.java:822)
at sqlline.SqlLine.begin(SqlLine.java:596)
at sqlline.SqlLine.start(SqlLine.java:269)
at sqlline.SqlLine.main(SqlLine.java:208)
H2 JDBC driver version is latest (2.1.214)