use Parquet.jl named tuples iterator: RecordCursor

[tanmaykm]

This Parquet.jl update will add a named tuple iterator RecordReader. We will be able to use that here directly, instead of wrapping over the older RecCursor.

The new map_logical_types option to ParFile automatically converts byte arrays to strings, so we do not need to handle that here now.

This can be merged after JuliaIO/Parquet.jl#71 is released in Parquet.jl

[blairn]

I think this broke live.

julia> using Queryverse
[ Info: Precompiling Queryverse [612083be-0b0f-5412-89c1-4e7c75506a58]
[ Info: Installing xlrd via the Conda xlrd package...
[ Info: Running conda install -y xlrd in root environment
Collecting package metadata (current_repodata.json): done
Solving environment: done

Package Plan

environment location: /home/blair/.julia/conda/3

added / updated specs:
- xlrd

The following packages will be downloaded:

package                    |            build
---------------------------|-----------------
xlrd-1.2.0                 |           py37_0         175 KB
------------------------------------------------------------
                                       Total:         175 KB

The following NEW packages will be INSTALLED:

xlrd pkgs/main/linux-64::xlrd-1.2.0-py37_0

Downloading and Extracting Packages
xlrd-1.2.0 | 175 KB | ################################################################################################################################################################ | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
ERROR: LoadError: UndefVarError: RecCursor not defined
Stacktrace:
[1] top-level scope at /home/blair/.julia/packages/ParquetFiles/cLLFb/src/ParquetFiles.jl:26
[2] include(::Module, ::String) at ./Base.jl:377
[3] top-level scope at none:2
[4] eval at ./boot.jl:331 [inlined]
[5] eval(::Expr) at ./client.jl:449
[6] top-level scope at ./none:3
in expression starting at /home/blair/.julia/packages/ParquetFiles/cLLFb/src/ParquetFiles.jl:26
ERROR: LoadError: Failed to precompile ParquetFiles [46a55296-af5a-53b0-aaa0-97023b66127f] to /home/blair/.julia/compiled/v1.4/ParquetFiles/WDBBU_eEoIX.ji.
Stacktrace:
[1] error(::String) at ./error.jl:33
[2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1272
[3] _require(::Base.PkgId) at ./loading.jl:1029
[4] require(::Base.PkgId) at ./loading.jl:927
[5] require(::Module, ::Symbol) at ./loading.jl:922
[6] include(::Module, ::String) at ./Base.jl:377
[7] top-level scope at none:2
[8] eval at ./boot.jl:331 [inlined]
[9] eval(::Expr) at ./client.jl:449
[10] top-level scope at ./none:3
in expression starting at /home/blair/.julia/packages/Queryverse/ysqbZ/src/Queryverse.jl:15
ERROR: Failed to precompile Queryverse [612083be-0b0f-5412-89c1-4e7c75506a58] to /home/blair/.julia/compiled/v1.4/Queryverse/hLJnW_eEoIX.ji.
Stacktrace:
[1] error(::String) at ./error.jl:33
[2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1272
[3] _require(::Base.PkgId) at ./loading.jl:1029
[4] require(::Base.PkgId) at ./loading.jl:927
[5] require(::Module, ::Symbol) at ./loading.jl:922

[blairn]

Rec cursor isn't defined any more, but, it is being referred to.

[tanmaykm]

I think merging this would fix that issue. Parquet.jl has moved to v0.5 where there is no RecCursor, and this PR addresses that.

I feel there should be an upperbound to the compat version range here so that we don't run into this issue again. I shall push a commit with that in a bit.

[tanmaykm]

@davidanthoff does this look good to be merged?

[xiaodaigh]

I'd say merge this with master to fix the conflicts in Project.toml which has proper upper bounding.

[xiaodaigh]

merging this will fix #26 and all the file read issues