If an object name or literal returned in an EXPLAIN report includes a character not in the the session character set, or is otherwise unprintable, the name or literal is shown as a UNICODE delimited identifier or literal.
Each non-representable character is escaped to its hexadecimal equivalent.
The system uses BACKSLASH (U+005C), if available, as the escape character. If BACKSLASH is not available:
- If either YEN SIGN (U+00A5) or WON SIGN (U+20A9) replaces BACKSLASH in the session character set, the system uses the replacement as the escape character.
- If none of the preceding characters is available, the system uses NUMBER SIGN (U+0023).
Object names that are translatable to the session character set, but are not lexically distinguishable as names are enclosed in double quotation marks.
See Object Names.