types: fix incompatible issue for builtin function str_to_date (pingcap#9693)

Author: qw4990

expression/builtin_time_test.go

@@ -1251,6 +1251,11 @@ func (s *testEvaluatorSuite) TestStrToDate(c *C) {
 		{"2016 11 22 16 50 22", `%Y%m%d%H%i%s`, true, time.Date(2016, 11, 22, 16, 50, 22, 0, time.Local)},
 		{"16-50-22 2016 11 22", `%H-%i-%s%Y%m%d`, true, time.Date(2016, 11, 22, 16, 50, 22, 0, time.Local)},
 		{"16-50 2016 11 22", `%H-%i-%s%Y%m%d`, false, time.Time{}},
+		{"15-01-2001 1:59:58.999", "%d-%m-%Y %I:%i:%s.%f", true, time.Date(2001, 1, 15, 1, 59, 58, 999000000, time.Local)},
+		{"15-01-2001 1:59:58.1", "%d-%m-%Y %H:%i:%s.%f", true, time.Date(2001, 1, 15, 1, 59, 58, 100000000, time.Local)},
+		{"15-01-2001 1:59:58.", "%d-%m-%Y %H:%i:%s.%f", true, time.Date(2001, 1, 15, 1, 59, 58, 000000000, time.Local)},
+		{"15-01-2001 1:9:8.999", "%d-%m-%Y %H:%i:%s.%f", true, time.Date(2001, 1, 15, 1, 9, 8, 999000000, time.Local)},
+		{"15-01-2001 1:9:8.999", "%d-%m-%Y %H:%i:%S.%f", true, time.Date(2001, 1, 15, 1, 9, 8, 999000000, time.Local)},
 	}
 
 	fc := funcs[ast.StrToDate]

types/time.go

@@ -2152,8 +2152,8 @@ var dateFormatParserTable = map[string]dateFormatParser{
 	"%e": dayOfMonthNumeric,     // Day of the month, numeric (0..31)
 	"%f": microSeconds,          // Microseconds (000000..999999)
 	"%h": hour24TwoDigits,       // Hour (01..12)
-	"%H": hour24TwoDigits,       // Hour (01..12)
-	"%I": hour24TwoDigits,       // Hour (01..12)
+	"%H": hour24Numeric,         // Hour (00..23)
+	"%I": hour12Numeric,         // Hour (01..12)
 	"%i": minutesNumeric,        // Minutes, numeric (00..59)
 	"%j": dayOfYearThreeDigits,  // Day of year (001..366)
 	"%k": hour24Numeric,         // Hour (0..23)
@@ -2257,21 +2257,27 @@ func hour24TwoDigits(t *MysqlTime, input string, ctx map[string]int) (string, bo
 }
 
 func secondsNumeric(t *MysqlTime, input string, ctx map[string]int) (string, bool) {
-	v, succ := parseDigits(input, 2)
+	result := oneOrTwoDigitRegex.FindString(input)
+	length := len(result)
+
+	v, succ := parseDigits(input, length)
 	if !succ || v >= 60 {
 		return input, false
 	}
 	t.second = uint8(v)
-	return input[2:], true
+	return input[length:], true
 }
 
 func minutesNumeric(t *MysqlTime, input string, ctx map[string]int) (string, bool) {
-	v, succ := parseDigits(input, 2)
+	result := oneOrTwoDigitRegex.FindString(input)
+	length := len(result)
+
+	v, succ := parseDigits(input, length)
 	if !succ || v >= 60 {
 		return input, false
 	}
 	t.minute = uint8(v)
-	return input[2:], true
+	return input[length:], true
 }
 
 const time12HourLen = len("hh:mm:ssAM")
@@ -2368,6 +2374,9 @@ var oneOrTwoDigitRegex = regexp.MustCompile("^[0-9]{1,2}")
 // twoDigitRegex: it was just for two digit number string. Ex: "01" or "12"
 var twoDigitRegex = regexp.MustCompile("^[1-9][0-9]?")
 
+// oneToSixDigitRegex: it was just for [0, 999999]
+var oneToSixDigitRegex = regexp.MustCompile("^[0-9]{0,6}")
+
 // parseTwoNumeric is used for pattens 0..31 0..24 0..60 and so on.
 // It returns the parsed int, and remain data after parse.
 func parseTwoNumeric(input string) (int, string) {
@@ -2427,15 +2436,23 @@ func hour12Numeric(t *MysqlTime, input string, ctx map[string]int) (string, bool
 }
 
 func microSeconds(t *MysqlTime, input string, ctx map[string]int) (string, bool) {
-	if len(input) < 6 {
-		return input, false
+	result := oneToSixDigitRegex.FindString(input)
+	length := len(result)
+	if length == 0 {
+		t.microsecond = 0
+		return input, true
 	}
-	v, err := strconv.ParseUint(input[:6], 10, 64)
-	if err != nil {
+
+	v, ok := parseDigits(input, length)
+
+	if !ok {
 		return input, false
 	}
+	for v > 0 && v*10 < 1000000 {
+		v *= 10
+	}
 	t.microsecond = uint32(v)
-	return input[6:], true
+	return input[length:], true
 }
 
 func yearNumericFourDigits(t *MysqlTime, input string, ctx map[string]int) (string, bool) {