LIKE clause

[ricardocchaves]

Adds a LIKE function to the WHERE clause for easier matching. Closes #17

Some notes

• Right now it can match not only with strings but also with everything else, as the values are stringified before matching. Let me know if this is not intended and if it should be for strings only.
• It only supports the % wildcard operator.
• Let me know if the commit messages should follow a specific format

Future work

Either in the scope of this PR or in a future one, it is still missing other basic matching functions, like _ for single character matching or [] to specify a range.

[ricardocchaves]

How can I get a syntax error like the following:

$ python spyql 'SELECT * from range(3) WHERE'
ERROR   could not compile FROM clause
  File "<from>", line 1
    range(3) WHERE
                 ^
SyntaxError: unexpected EOF while parsing

But for LIKE? Should I change this or can it be kept as is? Desired output / behavior:

$ python spyql 'SELECT * from range(3) WHERE col1 LIKE'
ERROR   could not compile WHERE clause
  File "<from>", line 1
    col1 LIKE
            ^
SyntaxError: unexpected EOF while parsing

Current:

$ python spyql 'SELECT * from range(3) WHERE col1 LIKE'
ERROR   col1 LIKE
SyntaxError: unexpected EOF while parsing

[codecov[bot]]

Codecov Report

Merging #67 (0e0a830) into master (c379afa) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   95.91%   95.98%   +0.07%     
==========================================
  Files          10       10              
  Lines        1076     1096      +20     
==========================================
+ Hits         1032     1052      +20     
  Misses         44       44              

Impacted Files	Coverage Δ
spyql/cli.py	99.06% <100.00%> (+0.08%)	:arrow_up:
spyql/quotes_handler.py	97.29% <100.00%> (+0.15%)	:arrow_up:

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[ricardocchaves]

As discussed offline:

• I'll look into escaping regex characters that may appear innocently in the string
• I'll implement the like function that takes two strings (whether they're constants, columns, etc.) and returns boolean. Will look into that stack overflow URL, overriding operators.

[dcmoura]

Archiving due to lack of activity. Happy to reopen when you are ready!