#89: Added missing Exasol predicates

[morazow]

Fixes #89.

[codecov]

Codecov Report

Merging #91 (edb554f) into main (256bc16) will decrease coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
- Coverage   95.76%   95.35%   -0.41%     
==========================================
  Files          11       11              
  Lines         425      431       +6     
  Branches       48       48              
==========================================
+ Hits          407      411       +4     
- Misses         18       20       +2     

Impacted Files	Coverage Δ
src/main/scala/com/exasol/spark/util/Filters.scala	100.00% <100.00%> (ø)
...rc/main/scala/com/exasol/spark/rdd/ExasolRDD.scala	83.05% <0.00%> (-3.39%)	⬇️

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