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From "Daniel Barclay (Drill) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3403) <Unicode 6 digit escape value> handled incorrectly
Date Fri, 26 Jun 2015 20:48:04 GMT
Daniel Barclay (Drill) created DRILL-3403:

             Summary: <Unicode 6 digit escape value> handled incorrectly
                 Key: DRILL-3403
                 URL: https://issues.apache.org/jira/browse/DRILL-3403
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Daniel Barclay (Drill)

The {{<Unicode 6 digit escape value>}} syntax (e.g., U&'$+000000' UESCAPE '$') is
not handled correctly.

In particular, the parser doesn't seem to recognize that the first character after the escape
character is a "{{+}}", it takes the first three hex digits and decodes them into a character,
and then it takes the next three hex-digit characters as plain characters.

In the following, note how the part with a backslash followed by the {{+000043}} part yields
a NULL (as evidenced by the unaligned trailing vertical bar) and "043" instead of yielding

0: jdbc:drill:zk=local> SELECT  U&'\0041 2 \+000043'  UESCAPE '\' FROM INFORMATION_SCHEMA.CATALOGS;
|  EXPR$0   |
| A 2 043  |
1 row selected (0.253 seconds)
0: jdbc:drill:zk=local> 

(This means that Drill can't accept character string literals containing characters beyond
code point U+00FFFF.)

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