feat: implement MSSQL row transformation and loading functions

cmd/go_migrate/transformer.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"time"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func transformRowsMssql(columns []ColumnType, in <-chan []UnknownRowValues, out chan<- []UnknownRowValues) {
+	for rows := range in {
+		log.Debugf("Chunk received, transforming...")
+
+		for _, rowValues := range rows {
+			for i, col := range columns {
+				value := rowValues[i]
+				if col.SystemType() == "uniqueidentifier" {
+					if b, ok := value.([]byte); ok {
+						rowValues[i] = mssqlUuidToBigEndian(b)
+					}
+				} else if col.SystemType() == "geometry" || col.SystemType() == "geography" {
+					if b, ok := value.([]byte); ok {
+						rowValues[i] = wkbToEwkbWithSrid(b, 4326)
+					}
+				} else if col.SystemType() == "datetime" || col.SystemType() == "datetime2" {
+					if t, ok := value.(time.Time); ok {
+						rowValues[i] = ensureUTC(t)
+					}
+				}
+			}
+		}
+
+		out <- rows
+	}
+}