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executor: fix csv parser #9005

Merged
merged 11 commits into from
Jan 15, 2019
Merged

executor: fix csv parser #9005

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41724fc
fix load data
Jan 10, 2019
a689a76
add comment for review
Jan 10, 2019
f074157
fix go lint
Jan 10, 2019
f55713f
fix ci
Jan 10, 2019
cbab6b7
fix go lont
Jan 10, 2019
043eb85
made code more readable
Jan 11, 2019
9a4fe9c
fix golint
Jan 11, 2019
2b0e992
add more test case
Jan 11, 2019
48356f5
add comment
Jan 15, 2019
0f0b27b
add unit test
Jan 15, 2019
d5eb2f7
Merge branch 'master' into fixloaddata
jackysp Jan 15, 2019
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7 changes: 6 additions & 1 deletion executor/executor_pkg_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,11 @@ func (s *testExecSuite) TestGetFieldsFromLine(c *C) {
`"\0\b\n\r\t\Z\\\ \c\'\""`,
[]string{string([]byte{0, '\b', '\n', '\r', '\t', 26, '\\', ' ', ' ', 'c', '\'', '"'})},
},
// Test mixed.
{
`"123",456,"\t7890",abcd`,
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It is better to add more test cases to guarantee the behavior we support.

[]string{"123", "456", "\t7890", "abcd"},
},
}

ldInfo := LoadDataInfo{
Expand All @@ -214,7 +219,7 @@ func (s *testExecSuite) TestGetFieldsFromLine(c *C) {
}

_, err := ldInfo.getFieldsFromLine([]byte(`1,a string,100.20`))
c.Assert(err, NotNil)
c.Assert(err, IsNil)
}

func assertEqualStrings(c *C, got []field, expect []string) {
Expand Down
185 changes: 164 additions & 21 deletions executor/load_data.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,6 @@
package executor

import (
"bytes"
"context"
"fmt"
"strings"
Expand Down Expand Up @@ -209,7 +208,6 @@ func (e *LoadDataInfo) InsertData(prevData, curData []byte) ([]byte, bool, error
if len(prevData) == 0 && len(curData) == 0 {
return nil, false, nil
}

var line []byte
var isEOF, hasStarting, reachLimit bool
if len(prevData) > 0 && len(curData) == 0 {
Expand All @@ -220,7 +218,6 @@ func (e *LoadDataInfo) InsertData(prevData, curData []byte) ([]byte, bool, error
for len(curData) > 0 {
line, curData, hasStarting = e.getLine(prevData, curData)
prevData = nil

// If it doesn't find the terminated symbol and this data isn't the last data,
// the data can't be inserted.
if line == nil && !isEOF {
Expand Down Expand Up @@ -313,28 +310,174 @@ func (e *LoadDataInfo) addRecordLD(row []types.Datum) (int64, error) {
type field struct {
str []byte
maybeNull bool
enclosed bool
}

type fieldWriter struct {
pos int
enclosedChar byte
fieldTermChar byte
term *string
isEnclosed bool
isLineStart bool
isFieldStart bool
ReadBuf *[]byte
OutputBuf []byte
}

func (w *fieldWriter) Init(enclosedChar byte, fieldTermChar byte, readBuf *[]byte, term *string) {
w.isEnclosed = false
w.isLineStart = true
w.isFieldStart = true
w.ReadBuf = readBuf
w.enclosedChar = enclosedChar
w.fieldTermChar = fieldTermChar
w.term = term
}

func (w *fieldWriter) putback() {
w.pos--
}

func (w *fieldWriter) getChar() (bool, byte) {
if w.pos < len(*w.ReadBuf) {
ret := (*w.ReadBuf)[w.pos]
w.pos++
return true, ret
}
return false, 0
}

func (w *fieldWriter) isTerminator() bool {
chkpt, isterm := w.pos, true
for i := 1; i < len(*w.term); i++ {
flag, ch := w.getChar()
if !flag || ch != (*w.term)[i] {
isterm = false
break
}
}
if !isterm {
w.pos = chkpt
return false
}
return true
}

func (w *fieldWriter) outputField(enclosed bool) field {
var fild []byte
start := 0
if enclosed {
start = 1
}
for i := start; i < len(w.OutputBuf); i++ {
fild = append(fild, w.OutputBuf[i])
}
if len(fild) == 0 {
fild = []byte("")
}
w.OutputBuf = w.OutputBuf[0:0]
w.isEnclosed = false
w.isFieldStart = true
return field{fild, false, enclosed}
}

func (w *fieldWriter) GetField() (bool, field) {
// The first return value implies whether fieldWriter read the last character of line.
if w.isLineStart {
_, ch := w.getChar()
if ch == w.enclosedChar {
w.isEnclosed = true
w.isFieldStart, w.isLineStart = false, false
w.OutputBuf = append(w.OutputBuf, ch)
} else {
w.putback()
}
}
for {
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Now it's complex enough and more difficult to maintain.
If we meet some error next time, I'll consider use some more general method instead of hard written those things.

flag, ch := w.getChar()
if !flag {
ret := w.outputField(false)
return true, ret
}
if ch == w.enclosedChar && w.isFieldStart {
// If read enclosed char at field start.
w.isEnclosed = true
w.OutputBuf = append(w.OutputBuf, ch)
w.isLineStart, w.isFieldStart = false, false
continue
}
w.isLineStart, w.isFieldStart = false, false
if ch == w.fieldTermChar && !w.isEnclosed {
// If read filed terminate char.
if w.isTerminator() {
ret := w.outputField(false)
return false, ret
}
w.OutputBuf = append(w.OutputBuf, ch)
} else if ch == w.enclosedChar && w.isEnclosed {
// If read enclosed char, look ahead.
flag, ch = w.getChar()
if !flag {
ret := w.outputField(true)
return true, ret
} else if ch == w.enclosedChar {
w.OutputBuf = append(w.OutputBuf, ch)
continue
} else if ch == w.fieldTermChar {
// If the next char is fieldTermChar, look ahead.
if w.isTerminator() {
ret := w.outputField(true)
return false, ret
}
w.OutputBuf = append(w.OutputBuf, ch)
} else {
// If there is no terminator behind enclosedChar, put the char back.
w.OutputBuf = append(w.OutputBuf, w.enclosedChar)
w.putback()
}
} else if ch == '\\' {
// TODO: escape only support '\'
w.OutputBuf = append(w.OutputBuf, ch)
flag, ch = w.getChar()
if flag {
if ch == w.enclosedChar {
w.OutputBuf = append(w.OutputBuf, ch)
} else {
w.putback()
}
}
} else {
w.OutputBuf = append(w.OutputBuf, ch)
}
}
}

// getFieldsFromLine splits line according to fieldsInfo.
func (e *LoadDataInfo) getFieldsFromLine(line []byte) ([]field, error) {
var sep []byte
if e.FieldsInfo.Enclosed != 0 {
if line[0] != e.FieldsInfo.Enclosed || line[len(line)-1] != e.FieldsInfo.Enclosed {
return nil, errors.Errorf("line %s should begin and end with %c", string(line), e.FieldsInfo.Enclosed)
var (
reader fieldWriter
fields []field
)

if len(line) == 0 {
str := []byte("")
fields = append(fields, field{str, false, false})
return fields, nil
}

reader.Init(e.FieldsInfo.Enclosed, e.FieldsInfo.Terminated[0], &line, &e.FieldsInfo.Terminated)
for {
eol, f := reader.GetField()
f = f.escape()
if string(f.str) == "NULL" && !f.enclosed {
f.str = []byte{'N'}
f.maybeNull = true
}
fields = append(fields, f)
if eol {
break
}
line = line[1 : len(line)-1]
sep = make([]byte, 0, len(e.FieldsInfo.Terminated)+2)
sep = append(sep, e.FieldsInfo.Enclosed)
sep = append(sep, e.FieldsInfo.Terminated...)
sep = append(sep, e.FieldsInfo.Enclosed)
} else {
sep = []byte(e.FieldsInfo.Terminated)
}
rawCols := bytes.Split(line, sep)
fields := make([]field, 0, len(rawCols))
for _, v := range rawCols {
f := field{v, false}
fields = append(fields, f.escape())
}
return fields, nil
}
Expand All @@ -354,7 +497,7 @@ func (f *field) escape() field {
f.str[pos] = c
pos++
}
return field{f.str[:pos], f.maybeNull}
return field{f.str[:pos], f.maybeNull, f.enclosed}
}

func (f *field) escapeChar(c byte) byte {
Expand Down
143 changes: 143 additions & 0 deletions server/server_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -483,6 +483,149 @@ func runTestLoadData(c *C, server *Server) {
dbt.Assert(err, NotNil)
})

err = fp.Close()
c.Assert(err, IsNil)
err = os.Remove(path)
c.Assert(err, IsNil)

fp, err = os.Create(path)
c.Assert(err, IsNil)
c.Assert(fp, NotNil)

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You can os.Remove(path) here immediately.

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The next test case still use this file.

// Test mixed unenclosed and enclosed fields.
_, err = fp.WriteString(
"\"abc\",123\n" +
"def,456,\n" +
"hig,\"789\",")
c.Assert(err, IsNil)

runTestsOnNewDB(c, func(config *mysql.Config) {
config.AllowAllFiles = true
config.Strict = false
}, "LoadData", func(dbt *DBTest) {
dbt.mustExec("create table test (str varchar(10) default null, i int default null)")
_, err1 := dbt.db.Exec(`load data local infile '/tmp/load_data_test.csv' into table test FIELDS TERMINATED BY ',' enclosed by '"'`)
dbt.Assert(err1, IsNil)
var (
str string
id int
)
rows := dbt.mustQuery("select * from test")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
err = rows.Scan(&str, &id)
dbt.Check(err, IsNil)
dbt.Check(str, DeepEquals, "abc")
dbt.Check(id, DeepEquals, 123)
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&str, &id)
dbt.Check(str, DeepEquals, "def")
dbt.Check(id, DeepEquals, 456)
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&str, &id)
dbt.Check(str, DeepEquals, "hig")
dbt.Check(id, DeepEquals, 789)
dbt.Check(rows.Next(), IsFalse, Commentf("unexpected data"))
dbt.mustExec("delete from test")
})

err = fp.Close()
c.Assert(err, IsNil)
err = os.Remove(path)
c.Assert(err, IsNil)

fp, err = os.Create(path)
c.Assert(err, IsNil)
c.Assert(fp, NotNil)

// Test irregular csv file.
_, err = fp.WriteString(
`,\N,NULL,,` + "\n" +
"00,0,000000,,\n" +
`2003-03-03, 20030303,030303,\N` + "\n")
c.Assert(err, IsNil)

runTestsOnNewDB(c, func(config *mysql.Config) {
config.AllowAllFiles = true
config.Strict = false
}, "LoadData", func(dbt *DBTest) {
dbt.mustExec("create table test (a date, b date, c date not null, d date)")
_, err1 := dbt.db.Exec(`load data local infile '/tmp/load_data_test.csv' into table test FIELDS TERMINATED BY ','`)
dbt.Assert(err1, IsNil)
var (
a sql.NullString
b sql.NullString
d sql.NullString
c sql.NullString
)
rows := dbt.mustQuery("select * from test")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
err = rows.Scan(&a, &b, &c, &d)
dbt.Check(err, IsNil)
dbt.Check(a.String, Equals, "0000-00-00")
dbt.Check(b.String, Equals, "")
dbt.Check(c.String, Equals, "0000-00-00")
dbt.Check(d.String, Equals, "0000-00-00")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&a, &b, &c, &d)
dbt.Check(a.String, Equals, "0000-00-00")
dbt.Check(b.String, Equals, "0000-00-00")
dbt.Check(c.String, Equals, "0000-00-00")
dbt.Check(d.String, Equals, "0000-00-00")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&a, &b, &c, &d)
dbt.Check(a.String, Equals, "2003-03-03")
dbt.Check(b.String, Equals, "2003-03-03")
dbt.Check(c.String, Equals, "2003-03-03")
dbt.Check(d.String, Equals, "")
dbt.Check(rows.Next(), IsFalse, Commentf("unexpected data"))
dbt.mustExec("delete from test")
})

err = fp.Close()
c.Assert(err, IsNil)
err = os.Remove(path)
c.Assert(err, IsNil)

fp, err = os.Create(path)
c.Assert(err, IsNil)
c.Assert(fp, NotNil)

// Test double enclosed.
_, err = fp.WriteString(
`"field1","field2"` + "\n" +
`"a""b","cd""ef"` + "\n" +
`"a"b",c"d"e` + "\n")
c.Assert(err, IsNil)

runTestsOnNewDB(c, func(config *mysql.Config) {
config.AllowAllFiles = true
config.Strict = false
}, "LoadData", func(dbt *DBTest) {
dbt.mustExec("create table test (a varchar(20), b varchar(20))")
_, err1 := dbt.db.Exec(`load data local infile '/tmp/load_data_test.csv' into table test FIELDS TERMINATED BY ',' enclosed by '"'`)
dbt.Assert(err1, IsNil)
var (
a sql.NullString
b sql.NullString
)
rows := dbt.mustQuery("select * from test")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
err = rows.Scan(&a, &b)
dbt.Check(err, IsNil)
dbt.Check(a.String, Equals, "field1")
dbt.Check(b.String, Equals, "field2")
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&a, &b)
dbt.Check(a.String, Equals, `a"b`)
dbt.Check(b.String, Equals, `cd"ef`)
dbt.Check(rows.Next(), IsTrue, Commentf("unexpected data"))
rows.Scan(&a, &b)
dbt.Check(a.String, Equals, `a"b`)
dbt.Check(b.String, Equals, `c"d"e`)
dbt.Check(rows.Next(), IsFalse, Commentf("unexpected data"))
dbt.mustExec("delete from test")
})

// unsupport ClientLocalFiles capability
server.capability ^= tmysql.ClientLocalFiles
runTestsOnNewDB(c, func(config *mysql.Config) {
Expand Down