github.com/matrixorigin/matrixone@v0.7.0/test/distributed/resources/load_data/char_varchar_1.csv (about)

     1  a,b,c,d
     2  "a","b","c","d"
     3  'a','b','c','d'
     4  "'a'","'b'","'c'","'d'"
     5  "aa,aa","bb,bb","cc,cc","dd,dd"
     6  "aa,","bb,","cc,","dd,"
     7  "aa,,,aa","bb,,,bb","cc,,,cc","dd,,,dd"
     8  "aa',',,aa","bb',',,bb","cc',',,cc","dd',',,dd"
     9  aa"aa,bb"bb,cc"cc,dd"dd
    10  "aa"aa","bb"bb","cc"cc","dd"dd"
    11  "aa""aa","bb""bb","cc""cc","dd""dd"
    12  "aa"""aa","bb"""bb","cc"""cc","dd"""dd"
    13  "aa""""aa","bb""""bb","cc""""cc","dd""""dd"
    14  "aa"",aa","bb"",bb","cc"",cc","dd"",dd"
    15  "aa"""",aa","bb"""",bb","cc"""",cc","dd"""",dd"
    16  ,,,
    17  ,,,,
    18  \N,\N,\N,\N
    19  "","","",
    20  """","""","""",""""
    21  """""","""""","""""",""""""