[vertx-db2-client] SQL with 'fetch first 1 rows only' causes 'Found unknown codepoint: 0x215f / 8543'

Queries using fetch first 1 rows only doesn’t seem to work. Query example:

select message from immutable order by id fetch first 1 rows only

Version

vertx-db2-client versions 3.9.5 and 4.0.2.

Context

Exception:

[2021-02-13 09:33:58] FINE io.vertx.db2client.impl.codec.DB2Decoder                <<< DECODE io.vertx.db2client.impl.codec.InitialHandshakeCommandCodec@6bf9ad5d (432 bytes)
[2021-02-13 09:33:58] FINE io.vertx.db2client.impl.codec.DB2Encoder                >>> ENCODE SimpleQueryCommandCodec@fe7e38d sql=select message from immutable order by id fetch first 1 rows only, section=null
[2021-02-13 09:33:58] FINE io.vertx.db2client.impl.codec.DB2Decoder                <<< DECODE SimpleQueryCommandCodec@fe7e38d sql=select message from immutable order by id fetch first 1 rows only, section=io.vertx.db2client.impl.drda.Section@677ec5e7{packageName=SYSSH200, sectionNumber=1, cursorName=SQL_CURSH200C} (472 bytes)
[2021-02-13 09:33:58] FINE io.vertx.db2client.impl.drda.Section release            Releasing section: io.vertx.db2client.impl.drda.Section@677ec5e7{packageName=SYSSH200, sectionNumber=1, cursorName=SQL_CURSH200C}
[2021-02-13 09:33:58] SEVERE io.vertx.db2client.impl.codec.DB2Decoder                FATAL: Error parsing buffer at index 258 / 0x102
For command SimpleQueryCommandCodec@fe7e38d sql=select message from immutable order by id fetch first 1 rows only, section=io.vertx.db2client.impl.drda.Section@677ec5e7{packageName=SYSSH200, sectionNumber=1, cursorName=SQL_CURSH200C}
         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 00 d6 d0 43 00 01 00 d0 24 11 00 00 00 00 00 30 |...C....$......0|
|00000010| 30 30 30 30 53 51 4c 31 31 30 35 30 00 00 00 00 |0000SQL11050....|
|00000020| 00 00 00 00 00 01 00 00 00 07 00 00 00 21 ff ff |.............!..|
|00000030| ff 00 00 00 00 20 20 20 20 20 20 20 20 20 20 20 |.....           |
|00000040| 00 12 56 45 52 54 58 20 20 20 20 20 20 20 20 20 |..VERTX         |
|00000050| 20 20 20 20 00 00 00 00 ff 00 01 00 00 00 00 00 |    ............|
|00000060| 00 00 55 00 00 00 00 00 00 00 00 00 01 00 00 00 |..U.............|
|00000070| 00 00 00 08 00 00 00 00 00 00 c0 01 04 b8 00 00 |................|
|00000080| 00 00 07 4d 45 53 53 41 47 45 00 00 00 00 00 00 |...MESSAGE......|
|00000090| 00 00 00 00 ff 00 00 00 00 00 00 00 00 00 00 05 |................|
|000000a0| 56 45 52 54 58 00 09 49 4d 4d 55 54 41 42 4c 45 |VERTX..IMMUTABLE|
|000000b0| 00 00 00 09 49 4d 4d 55 54 41 42 4c 45 00 00 00 |....IMMUTABLE...|
|000000c0| 08 56 45 52 54 58 20 20 20 00 00 00 07 4d 45 53 |.VERTX   ....MES|
|000000d0| 53 41 47 45 00 00 00 34 d0 52 00 02 00 2e 22 05 |SAGE...4.R....".|
|000000e0| 00 06 11 49 00 00 00 06 21 02 24 17 00 05 21 1f |...I....!.$...!.|
|000000f0| f1 00 05 21 50 01 00 0c 21 5b 00 00 00 00 00 00 |...!P...![......|
|00000100| 00 00 00 08 21 5f 00 00 00 01 00 1f d0 53 00 02 |....!_.......S..|
|00000110| 00 19 24 1a 06 76 d0 3e 08 00 09 71 e0 54 00 01 |..$..v.>...q.T..|
|00000120| d0 00 01 06 71 f0 e0 00 00 00 30 d0 53 00 02 00 |....q.....0.S...|
|00000130| 2a 24 1b ff 00 00 22 66 6f 72 74 75 6e 65 3a 20 |*$...."fortune: |
|00000140| 4e 6f 20 73 75 63 68 20 66 69 6c 65 20 6f 72 20 |No such file or |
|00000150| 64 69 72 65 63 74 6f 72 79 00 26 d0 52 00 02 00 |directory.&.R...|
|00000160| 20 22 0b 00 06 11 49 00 04 00 16 21 10 e5 c5 d9 | "....I....!....|
|00000170| e3 e7 40 40 40 40 40 40 40 40 40 40 40 40 40 00 |..@@@@@@@@@@@@@.|
|00000180| 59 d0 03 00 02 00 53 24 08 00 64 00 00 00 30 32 |Y.....S$..d...02|
|00000190| 30 30 30 53 51 4c 52 49 30 31 46 00 01 00 04 80 |000SQLRI01F.....|
|000001a0| 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
|000001b0| 00 00 00 00 20 20 20 20 20 20 20 20 20 20 20 00 |....           .|
|000001c0| 12 56 45 52 54 58 20 20 20 20 20 20 20 20 20 20 |.VERTX          |
|000001d0| 20 20 20 00 00 00 00 ff                         |   .....        |
+--------+-------------------------------------------------+----------------+
java.lang.IllegalStateException: Found unknown codepoint: 0x215f / 8543
	at io.vertx.db2client.impl.drda.DRDAResponse.throwUnknownCodepoint(DRDAResponse.java:847)
	at io.vertx.db2client.impl.drda.DRDAQueryResponse.parseOPNQRYRM(DRDAQueryResponse.java:2224)
	at io.vertx.db2client.impl.drda.DRDAQueryResponse.parseBeginOpenQuery(DRDAQueryResponse.java:163)
	at io.vertx.db2client.impl.drda.DRDAQueryResponse.readBeginOpenQuery(DRDAQueryResponse.java:128)
	at io.vertx.db2client.impl.codec.SimpleQueryCommandCodec.decodeQuery(SimpleQueryCommandCodec.java:76)
	at io.vertx.db2client.impl.codec.QueryCommandBaseCodec.decodePayload(QueryCommandBaseCodec.java:69)
	at io.vertx.db2client.impl.codec.DB2Decoder.decodePayload(DB2Decoder.java:80)
	at io.vertx.db2client.impl.codec.DB2Decoder.decode(DB2Decoder.java:53)

Do you have a reproducer?

https://github.com/DavideD/vertx-sql-client/commit/e1d5ceb26780eb22d52f5f60db43c8ae19895013 Or, add this test to QueryVariationsTest:

  @Test
  public void testFetchFirst(TestContext ctx) {
    connect(ctx.asyncAssertSuccess(conn -> {
      conn.query("select message from immutable order by id fetch first 1 rows only").execute(
        ctx.asyncAssertSuccess(rowSet -> {
          ctx.assertEquals(1, rowSet.size());
          ctx.assertEquals(Arrays.asList("message"), rowSet.columnsNames());
          RowIterator<Row> rows = rowSet.iterator();
          ctx.assertTrue(rows.hasNext());
          Row row = rows.next();
          ctx.assertEquals("fortune: No such file or directory", row.getString(0));
          ctx.assertFalse(rows.hasNext());
          conn.close();
        }));
    }));
  }
``

[mswatosh]

I’ve got the recreate running in my local environment (thanks for providing it!).

Looks like we’re missing support for the Query Blocking Factor CodePoint (0x215F), I’ve got it added to the codepoints in CodePoint.java and I’m looking into how it will need to be handled in DRDAQueryResponse.

[vietj]

thanks @mswatosh this is the correct branch to use, you can back-port to branch 3.9 and we will release it in 3.9.8 scheduled soon