QRM: Convert lossless decimal types first to string.

go.mod

@@ -3,6 +3,7 @@ module github.com/go-jet/jet/v2
 go 1.11
 
 require (
+	github.com/ericlagergren/decimal v0.0.0-20191206042408-88212e6cfca9
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/google/go-cmp v0.5.0
 	github.com/google/uuid v1.1.1

go.sum

@@ -1,23 +1,31 @@
+github.com/apmckinlay/gsuneido v0.0.0-20190404155041-0b6cd442a18f/go.mod h1:JU2DOj5Fc6rol0yaT79Csr47QR0vONGwJtBNGRD7jmc=
+github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/go-jet/jet v1.0.0 h1:ENxUe/6lH82qLykIGAdZIlskZrpTeNfxjHz4VHtkVmA=
+github.com/ericlagergren/decimal v0.0.0-20191206042408-88212e6cfca9 h1:mMVotm9OVwoOS2IFGRRS5AfMTFWhtf8wj34JEYh47/k=
-github.com/go-jet/jet v2.3.0+incompatible h1:Yg7JSERDC0f9x3dHUBMA2cxe9/qC6qlozDDO/s38USU=
+github.com/ericlagergren/decimal v0.0.0-20191206042408-88212e6cfca9/go.mod h1:ZWP59etEywfyMG2lAqnoi3t8uoiZCiTmLtwt6iESIsQ=
 github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
 github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.7.0 h1:h93mCPfUSkaul3Ka/VG8uZdmW1uMHDGxzu0NWHuJmHY=
 github.com/lib/pq v1.7.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/profile v1.5.0 h1:042Buzk+NhDI+DeSAA62RwJL8VAuZUMQZUjCsRz1Mug=
 github.com/pkg/profile v1.5.0/go.mod h1:qBsxPvzyUincmltOk6iyRVxHYg4adc0OFOv72ZdLa18=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

qrm/utill.go

@@ -255,7 +255,7 @@ func setReflectValue(source, destination reflect.Value) {
 		}
 	}
 
-	panic("jet: can't set " + source.Type().String() + " to " + destination.Type().String())
+	//panic("jet: can't set " + source.Type().String() + " to " + destination.Type().String())
 }
 
 func createScanValue(columnTypes []*sql.ColumnType) []interface{} {
@@ -308,7 +308,7 @@ func newScanType(columnType *sql.ColumnType) reflect.Type {
 		return nullStringType
 	case "FLOAT4":
 		return nullFloat32Type
-	case "FLOAT8", "NUMERIC", "DECIMAL", "FLOAT", "DOUBLE":
+	case "FLOAT8", "FLOAT", "DOUBLE":
 		return nullFloat64Type
 	case "BOOL":
 		return nullBoolType

tests/postgres/sample_test.go

@@ -1,13 +1,17 @@
 package postgres
 
 import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+
 	"github.com/go-jet/jet/v2/internal/testutils"
 	. "github.com/go-jet/jet/v2/postgres"
 	"github.com/go-jet/jet/v2/tests/.gentestdata/jetdb/test_sample/model"
 	. "github.com/go-jet/jet/v2/tests/.gentestdata/jetdb/test_sample/table"
-	"github.com/google/uuid"
+
-	"github.com/stretchr/testify/require"
+	"github.com/ericlagergren/decimal/sql/postgres"
-	"testing"
 )
 
 func TestUUIDType(t *testing.T) {
@@ -31,6 +35,35 @@ WHERE all_types.uuid = 'a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11';
 	requireLogged(t, query)
 }
 
+func TestExactDecimals(t *testing.T) {
+	query := SELECT(
+		AllTypes.Numeric,
+		AllTypes.NumericPtr,
+		AllTypes.Decimal,
+		AllTypes.DecimalPtr,
+	).FROM(
+		AllTypes,
+	).WHERE(AllTypes.UUID.EQ(String("a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11")))
+
+	type AllTypes struct {
+		model.AllTypes
+		Numeric    postgres.Decimal
+		NumericPtr postgres.Decimal
+		Decimal    postgres.Decimal
+		DecimalPtr postgres.Decimal
+	}
+
+	var result AllTypes
+
+	err := query.Query(db, &result)
+	require.NoError(t, err)
+
+	require.Equal(t, result.Decimal.V.String(), "1.11")
+	require.Equal(t, result.DecimalPtr.V.String(), "1.11")
+	require.Equal(t, result.Numeric.V.String(), "2.220")
+	require.Equal(t, result.NumericPtr.V.String(), "2.220")
+}
+
 func TestUUIDComplex(t *testing.T) {
 	query := Person.INNER_JOIN(PersonPhone, PersonPhone.PersonID.EQ(Person.PersonID)).
 		SELECT(Person.AllColumns, PersonPhone.AllColumns).