Add options to enable parsing CSV with single/double quote.

[amosbird]

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#2192 #2517

[alexey-milovidov]

TODO:

• rename settings to more descriptive names;
• check maximum performance difference in extreme case;

[alexey-milovidov]

Performance is Ok.

seq 1 1000000 | sed -r -e "s/^.+$/'',hello,'\0'/" > test.csv

for i in {1..100}; do (time ./clickhouse-master local --input-format CSV --structure 'a String, b String, c UInt64' --query="SELECT count() FROM table" < test.csv) 2>&1 | grep user; done | sort | head -n10

for i in {1..100}; do (time ./clickhouse-more-csv-settings local --input-format CSV --structure 'a String, b String, c UInt64' --query="SELECT count() FROM table" < test.csv) 2>&1 | grep user; done | sort | head -n10

No visible performance difference.

[alexey-milovidov]

Or it became a little better for unknown reason (no need to investigate):

$ for i in {1..100}; do (time ./clickhouse-master local --input-format CSV --structure 'a String, b String, c UInt64' --query="SELECT count() FROM table" < test.csv) 2>&1 | grep user; done | sort | head -n10
user    0m0.116s
user    0m0.120s
user    0m0.124s
user    0m0.124s
user    0m0.124s
user    0m0.124s
user    0m0.124s
user    0m0.124s
user    0m0.124s
user    0m0.128s
$ for i in {1..100}; do (time ./clickhouse-more-csv-settings local --input-format CSV --structure 'a String, b String, c UInt64' --query="SELECT count() FROM table" < test.csv) 2>&1 | grep user; done | sort | head -n10
user    0m0.112s
user    0m0.112s
user    0m0.112s
user    0m0.116s
user    0m0.116s
user    0m0.116s
user    0m0.116s
user    0m0.116s
user    0m0.116s
user    0m0.116s
$ for i in {1..100}; do (time clickhouse local --input-format CSV --structure 'a String, b String, c UInt64' --query="SELECT count() FROM table" < test.csv) 2>&1 | grep user; done | sort | head -n10
user    0m0.116s
user    0m0.116s
user    0m0.120s
user    0m0.120s
user    0m0.120s
user    0m0.120s
user    0m0.120s
user    0m0.120s
user    0m0.120s
user    0m0.120s