ANALYZE TABLE

[nils-braun]

Fixes #96

This PR introduces a new SQL statement:

ANALYZE TABLE <table> COMPUTE STATISTICS [FOR ALL COLUMNS | FOR COLUMNS a, b, ...]

Thanks to @quasiben for bringing it up. The query will not do any optimizations (as its pendant in e,g, spark), but will just output a table computed on the fly with the following properties:

"count",
"mean",
"std",
"min",
"25%",
"50%",
"75%",
"max",
"data_type",
"col_name",

If you have any more ideas on what to implement, I am happy to add this.

The PR is waiting for #104 for the documentation.

[codecov-io]

Codecov Report

Merging #105 (6f1e844) into main (a45deb1) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #105   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           39        40    +1     
  Lines         1611      1643   +32     
  Branches       224       229    +5     
=========================================
+ Hits          1611      1643   +32     

Impacted Files	Coverage Δ
dask_sql/context.py	100.00% <100.00%> (ø)
dask_sql/datacontainer.py	100.00% <100.00%> (ø)
dask_sql/physical/rel/custom/__init__.py	100.00% <100.00%> (ø)
dask_sql/physical/rel/custom/analyze.py	100.00% <100.00%> (ø)
dask_sql/physical/rel/custom/columns.py	100.00% <100.00%> (ø)
dask_sql/utils.py	100.00% <100.00%> (ø)

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[quasiben]

Thanks @nils-braun !