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refactor: Split sql_functions.go into smaller, focused files
**File Structure Before:** - sql_functions.go (850+ lines) - sql_functions_test.go (1,205+ lines) **File Structure After:** - function_helpers.go (105 lines) - shared utility functions - arithmetic_functions.go (205 lines) - arithmetic operators & math functions - datetime_functions.go (170 lines) - date/time functions & constants - string_functions.go (335 lines) - string manipulation functions - arithmetic_functions_test.go (560 lines) - tests for arithmetic & math - datetime_functions_test.go (370 lines) - tests for date/time functions - string_functions_test.go (270 lines) - tests for string functions **Benefits:** ✅ Better organization by functional domain ✅ Easier to find and maintain specific function types ✅ Smaller, more manageable file sizes ✅ Clear separation of concerns ✅ Improved code readability and navigation ✅ All tests passing - no functionality lost **Total:** 7 focused files (1,455 lines) vs 2 monolithic files (2,055+ lines) This refactoring improves maintainability while preserving all functionality.
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chrislu committed
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package engine
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import (
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"fmt"
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"strings"
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"time"
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"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
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)
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// ===============================
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// DATE/TIME CONSTANTS
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// ===============================
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// CurrentDate returns the current date as a string in YYYY-MM-DD format
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func (e *SQLEngine) CurrentDate() (*schema_pb.Value, error) {
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now := time.Now()
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dateStr := now.Format("2006-01-02")
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return &schema_pb.Value{
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Kind: &schema_pb.Value_StringValue{StringValue: dateStr},
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}, nil
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}
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// CurrentTimestamp returns the current timestamp
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func (e *SQLEngine) CurrentTimestamp() (*schema_pb.Value, error) {
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now := time.Now()
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// Return as TimestampValue with microseconds
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timestampMicros := now.UnixMicro()
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return &schema_pb.Value{
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Kind: &schema_pb.Value_TimestampValue{
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TimestampValue: &schema_pb.TimestampValue{
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TimestampMicros: timestampMicros,
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},
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},
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}, nil
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}
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// CurrentTime returns the current time as a string in HH:MM:SS format
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func (e *SQLEngine) CurrentTime() (*schema_pb.Value, error) {
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now := time.Now()
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timeStr := now.Format("15:04:05")
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return &schema_pb.Value{
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Kind: &schema_pb.Value_StringValue{StringValue: timeStr},
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}, nil
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}
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// Now is an alias for CurrentTimestamp (common SQL function name)
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func (e *SQLEngine) Now() (*schema_pb.Value, error) {
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return e.CurrentTimestamp()
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}
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// ===============================
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// EXTRACT FUNCTION
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// ===============================
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// DatePart represents the part of a date/time to extract
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type DatePart string
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const (
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PartYear DatePart = "YEAR"
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PartMonth DatePart = "MONTH"
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PartDay DatePart = "DAY"
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PartHour DatePart = "HOUR"
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PartMinute DatePart = "MINUTE"
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PartSecond DatePart = "SECOND"
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PartWeek DatePart = "WEEK"
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PartDayOfYear DatePart = "DOY"
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PartDayOfWeek DatePart = "DOW"
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PartQuarter DatePart = "QUARTER"
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PartEpoch DatePart = "EPOCH"
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)
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// Extract extracts a specific part from a date/time value
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func (e *SQLEngine) Extract(part DatePart, value *schema_pb.Value) (*schema_pb.Value, error) {
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if value == nil {
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return nil, fmt.Errorf("EXTRACT function requires non-null value")
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}
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// Convert value to time
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t, err := e.valueToTime(value)
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if err != nil {
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return nil, fmt.Errorf("EXTRACT function time conversion error: %v", err)
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}
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var result int64
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switch strings.ToUpper(string(part)) {
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case string(PartYear):
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result = int64(t.Year())
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case string(PartMonth):
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result = int64(t.Month())
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case string(PartDay):
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result = int64(t.Day())
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case string(PartHour):
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result = int64(t.Hour())
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case string(PartMinute):
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result = int64(t.Minute())
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case string(PartSecond):
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result = int64(t.Second())
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case string(PartWeek):
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_, week := t.ISOWeek()
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result = int64(week)
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case string(PartDayOfYear):
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result = int64(t.YearDay())
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case string(PartDayOfWeek):
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result = int64(t.Weekday())
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case string(PartQuarter):
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month := t.Month()
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result = int64((month-1)/3 + 1)
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case string(PartEpoch):
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result = t.Unix()
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default:
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return nil, fmt.Errorf("unsupported date part: %s", part)
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}
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return &schema_pb.Value{
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Kind: &schema_pb.Value_Int64Value{Int64Value: result},
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}, nil
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}
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// ===============================
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// DATE_TRUNC FUNCTION
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// ===============================
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// DateTrunc truncates a date/time to the specified precision
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func (e *SQLEngine) DateTrunc(precision string, value *schema_pb.Value) (*schema_pb.Value, error) {
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if value == nil {
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return nil, fmt.Errorf("DATE_TRUNC function requires non-null value")
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}
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// Convert value to time
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t, err := e.valueToTime(value)
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if err != nil {
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return nil, fmt.Errorf("DATE_TRUNC function time conversion error: %v", err)
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}
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var truncated time.Time
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switch strings.ToLower(precision) {
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case "microsecond", "microseconds":
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// No truncation needed for microsecond precision
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truncated = t
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case "millisecond", "milliseconds":
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truncated = t.Truncate(time.Millisecond)
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case "second", "seconds":
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truncated = t.Truncate(time.Second)
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case "minute", "minutes":
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truncated = t.Truncate(time.Minute)
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case "hour", "hours":
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truncated = t.Truncate(time.Hour)
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case "day", "days":
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truncated = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
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case "week", "weeks":
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// Truncate to beginning of week (Monday)
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days := int(t.Weekday())
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if days == 0 { // Sunday = 0, adjust to make Monday = 0
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days = 6
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} else {
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days = days - 1
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}
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truncated = time.Date(t.Year(), t.Month(), t.Day()-days, 0, 0, 0, 0, t.Location())
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case "month", "months":
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truncated = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
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case "quarter", "quarters":
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month := t.Month()
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quarterMonth := ((int(month)-1)/3)*3 + 1
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truncated = time.Date(t.Year(), time.Month(quarterMonth), 1, 0, 0, 0, 0, t.Location())
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case "year", "years":
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truncated = time.Date(t.Year(), 1, 1, 0, 0, 0, 0, t.Location())
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case "decade", "decades":
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year := (t.Year()/10) * 10
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truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
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case "century", "centuries":
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year := ((t.Year()-1)/100)*100 + 1
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truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
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case "millennium", "millennia":
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year := ((t.Year()-1)/1000)*1000 + 1
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truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
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default:
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return nil, fmt.Errorf("unsupported date truncation precision: %s", precision)
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}
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// Return as TimestampValue
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return &schema_pb.Value{
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Kind: &schema_pb.Value_TimestampValue{
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TimestampValue: &schema_pb.TimestampValue{
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TimestampMicros: truncated.UnixMicro(),
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},
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},
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}, nil
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}
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