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expression: the quote function should treat null expr as NULL literal string instead of NULL (#11592) #11619

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merged 5 commits into from
Aug 5, 2019
Merged

expression: the quote function should treat null expr as NULL literal string instead of NULL (#11592) #11619

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a901d38
expression: the quote func for null arg should map to "NULL" string
gaoxingliang Aug 2, 2019
1f8330c
expression: the quote func for null arg should map to "NULL" string (…
gaoxingliang Aug 2, 2019
3e458c8
expression: the quote func for null arg should map to "NULL" string (…
gaoxingliang Aug 2, 2019
a1b954f
Merge branch 'release-3.0' into release-3.0-5f9fe27a1475
zz-jason Aug 5, 2019
387e523
Merge branch 'release-3.0' into release-3.0-5f9fe27a1475
sre-bot Aug 5, 2019
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expression: the quote func for null arg should map to "NULL" string
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@gaoxingliang
gaoxingliang authored and root committed Aug 5, 2019
commit a901d38b9ab4f70d6b198314b320974516e27ed3
7 changes: 6 additions & 1 deletion expression/builtin_string.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2696,10 2696,15 @@ func (b *builtinQuoteSig) Clone() builtinFunc {
// See https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_quote
func (b *builtinQuoteSig) evalString(row chunk.Row) (string, bool, error) {
str, isNull, err := b.args[0].EvalString(b.ctx, row)
if isNull || err != nil {

if err != nil {
return "", true, err
} else if isNull {
// If the argument is NULL, the return value is the word “NULL” without enclosing single quotation marks.
return "NULL", false, err
}


runes := []rune(str)
buffer := bytes.NewBufferString("")
buffer.WriteRune('\'')
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13 changes: 13 additions & 0 deletions expression/integration_test.go
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Expand Up @@ -4699,3 4699,16 @@ func (s *testIntegrationSuite) TestIssue11309And11319(c *C) {
tk.MustQuery(`SELECT DATE_ADD('2007-03-28 22:08:28',INTERVAL 2.2 DAY_HOUR)`).Check(testkit.Rows("2007-03-31 00:08:28"))
tk.MustQuery(`SELECT DATE_ADD('2007-03-28 22:08:28',INTERVAL 2.2 YEAR_MONTH)`).Check(testkit.Rows("2009-05-28 22:08:28"))
}


func (s *testIntegrationSuite) TestQuote(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
tk.MustQuery(`select quote(null) is NULL;`).Check(testkit.Rows(`0`))
tk.MustQuery(`select quote(null) is NOT NULL;`).Check(testkit.Rows(`1`))
tk.MustQuery(`select length(quote(null));`).Check(testkit.Rows(`4`))
tk.MustQuery(`select quote(null) REGEXP binary 'null'`).Check(testkit.Rows(`0`))
tk.MustQuery(`select quote(null) REGEXP binary 'NULL'`).Check(testkit.Rows(`1`))
tk.MustQuery(`select quote(null) REGEXP 'NULL'`).Check(testkit.Rows(`1`))
tk.MustQuery(`select quote(null) REGEXP 'null'`).Check(testkit.Rows(`1`))
}