<IndexSearchCond>::=IndexSingleCond
LogicalOperator(<IndexSearchCond>,<IndexSearchCond>)
compress(Attr_name,<IndexSearchCond>)
IndexSingleCond::=RangeSearch 
Attr_name ComparisonOperator Attr_value 
Attr_name= concat(String,*) 
not_exist(Attr_name) 
is_null(Attr_name)
String::= STRING
Attr_name::= ATOM
ComparisonOperator::= =< 
< 
> 
>= 
=
LogicalOperator::= and 
or 
dif
RangeSearch::= range(Attr_name,Attr_value1,Attr_value2) 
etc.
Attr_value::= INTEGER 
STRING