SQL: allow identifier with placeholder such as '${a_1}' #3172
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Close #3169.
Some? dialects support shell-like variable substitution.
HiveQL is one of such dialects.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+VariableSubstitution
With this change, the SQL parser accepts '${var}' as a part of an identifier.
TODO:
var
itself can be extracted as a reference tag.Signed-off-by: Masatake YAMATO yamato@redhat.com