implementing indices
implementing row skipping
added row index to field reader
adding row skipping
adding skipping to file streams
adding index
adding index
row skipping looks like working (weird error at endfs)

Freeing footer in the execution state produces error, but it looks
like the reference is OK. Disabling it removes the error.
bugfix + addtion of list type to row skipping
index skipping added, testing...
bugfix - skipping indices when table has list type column
bugfix - skipping indices when table has list type column
refactoring & testing
looking at input stream reader
refactoring
refactoring
added converter