Use dolt JSON encoding

go.mod

@@ -6,10 +6,10 @@ require (
 	github.com/PuerkitoBio/goquery v1.8.1
 	github.com/cockroachdb/apd/v3 v3.2.3
 	github.com/cockroachdb/errors v1.7.5
-	github.com/dolthub/dolt/go v0.40.5-0.20260604223716-5ac466c68ca7
+	github.com/dolthub/dolt/go v0.40.5-0.20260605000101-c6f847cb5242
 	github.com/dolthub/eventsapi_schema v0.0.0-20260310172945-37a9265ade69
 	github.com/dolthub/flatbuffers/v23 v23.3.3-dh.2
-	github.com/dolthub/go-mysql-server v0.20.1-0.20260604212032-10e53f0a000e
+	github.com/dolthub/go-mysql-server v0.20.1-0.20260604232018-6a9dd7b59c86
 	github.com/dolthub/pg_query_go/v6 v6.0.0-20251215122834-fb20be4254d1
 	github.com/dolthub/sqllogictest/go v0.0.0-20240618184124-ca47f9354216
 	github.com/dolthub/vitess v0.0.0-20260604210335-0893abc80542
@@ -142,6 +142,7 @@ require (
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/juju/gnuflag v0.0.0-20171113085948-2ce1bb71843d // indirect
 	github.com/kch42/buzhash v0.0.0-20160816060738-9bdec3dec7c6 // indirect
 	github.com/klauspost/compress v1.18.0 // indirect

go.sum

@@ -246,8 +246,8 @@ github.com/dolthub/aws-sdk-go-ini-parser v0.0.0-20250305001723-2821c37f6c12 h1:I
 github.com/dolthub/aws-sdk-go-ini-parser v0.0.0-20250305001723-2821c37f6c12/go.mod h1:rN7X8BHwkjPcfMQQ2QTAq/xM3leUSGLfb+1Js7Y6TVo=
 github.com/dolthub/dolt-mcp v0.3.4 h1:AyG5cw+fNWXDHXujtQnqUPZrpWtPg6FN6yYtjv1pP44=
 github.com/dolthub/dolt-mcp v0.3.4/go.mod h1:bCZ7KHvDYs+M0e+ySgmGiNvLhcwsN7bbf5YCyillLrk=
-github.com/dolthub/dolt/go v0.40.5-0.20260604223716-5ac466c68ca7 h1:6j8kXiLYv9Uqty2D1XQl0+KEkh2IuxcY5jmIZiXg3rQ=
-github.com/dolthub/dolt/go v0.40.5-0.20260604223716-5ac466c68ca7/go.mod h1:W6qePjnOpTZacpBvU1WyhBLHP4ENC+lb5SELW7CjE40=
+github.com/dolthub/dolt/go v0.40.5-0.20260605000101-c6f847cb5242 h1:nx7bb7QFGHvZgCDjTDFQgU3IwdyKs0GI3fT9HqdnB1w=
+github.com/dolthub/dolt/go v0.40.5-0.20260605000101-c6f847cb5242/go.mod h1:VQdcfyqjyhjVDZSBagYjimKXfTQNYGtWA0MHx1fIGDU=
 github.com/dolthub/eventsapi_schema v0.0.0-20260310172945-37a9265ade69 h1:JShhbqMw26nKx3pqqu/cFxOpzBkN+4elVhzuUfgDw2k=
 github.com/dolthub/eventsapi_schema v0.0.0-20260310172945-37a9265ade69/go.mod h1:SSLraQS/jGLYFgff3vuZ+JbVUct6vyEeMzjLBqWqoyM=
 github.com/dolthub/flatbuffers/v23 v23.3.3-dh.2 h1:u3PMzfF8RkKd3lB9pZ2bfn0qEG+1Gms9599cr0REMww=
@@ -256,8 +256,8 @@ github.com/dolthub/fslock v0.0.5 h1:QoXhBhgY1oumHE26qyE7tgmXUT8qjJwxsIzo54O/B/k=
 github.com/dolthub/fslock v0.0.5/go.mod h1:sdofYYqE0D79zNZyB4/kmlnsQOVap1C2yByjGKSirEM=
 github.com/dolthub/go-icu-regex v0.0.0-20260412212219-49724d547866 h1:U6gSf5I0e6h6GP1/5Sa7D2lWW1CWfcVPtY5wkyHq6jY=
 github.com/dolthub/go-icu-regex v0.0.0-20260412212219-49724d547866/go.mod h1:F3cnm+vMRK1HaU6+rNqQrOCyR03HHhR1GWG2gnPOqaE=
-github.com/dolthub/go-mysql-server v0.20.1-0.20260604212032-10e53f0a000e h1:BI8QIYHQzWTluF1IL55H60PvK6tF+KUb0HyZpEsY9CY=
-github.com/dolthub/go-mysql-server v0.20.1-0.20260604212032-10e53f0a000e/go.mod h1:A3nEC4RgBm9UzuQCGhQhJDQAiFMPsZU3NPKbGhEd8R4=
+github.com/dolthub/go-mysql-server v0.20.1-0.20260604232018-6a9dd7b59c86 h1:V5tdwzJZOzaRHq7TpCP12/rHztVl7m3YKGZd8ej4h+E=
+github.com/dolthub/go-mysql-server v0.20.1-0.20260604232018-6a9dd7b59c86/go.mod h1:A3nEC4RgBm9UzuQCGhQhJDQAiFMPsZU3NPKbGhEd8R4=
 github.com/dolthub/gozstd v0.0.0-20240423170813-23a2903bca63 h1:OAsXLAPL4du6tfbBgK0xXHZkOlos63RdKYS3Sgw/dfI=
 github.com/dolthub/gozstd v0.0.0-20240423170813-23a2903bca63/go.mod h1:lV7lUeuDhH5thVGDCKXbatwKy2KW80L4rMT46n+Y2/Q=
 github.com/dolthub/ishell v0.0.0-20260414231531-5f031e3e9037 h1:oIW9HwuWrhxv+4HZxA+QQSKHLqWFyXZ2FmNjUYwkdiM=
@@ -520,7 +520,6 @@ github.com/jackc/pgx/v5 v5.9.2/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM
 github.com/jackc/puddle v0.0.0-20190413234325-e4ced69a3a2b/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
 github.com/jackc/puddle v0.0.0-20190608224051-11cab39313c9/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
 github.com/jackc/puddle v1.1.3/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
-github.com/jackc/puddle v1.3.0 h1:eHK/5clGOatcjX3oWGBO/MpxpbHzSwud5EWTSCI+MX0=
 github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
 github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
 github.com/jcmturner/gofork v0.0.0-20180107083740-2aebee971930/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/UM3ncEo0o=

server/cast/json.go

@@ -15,11 +15,11 @@
 package cast
 
 import (
+	"github.com/cockroachdb/errors"
 	"github.com/dolthub/go-mysql-server/sql"
 
 	"github.com/dolthub/doltgresql/core/casts"
 	"github.com/dolthub/doltgresql/core/id"
-
 	"github.com/dolthub/doltgresql/server/functions/framework"
 	pgtypes "github.com/dolthub/doltgresql/server/types"
 )
@@ -35,7 +35,20 @@ func jsonAssignment(builtInCasts map[id.Cast]casts.Cast) {
 		FromType: pgtypes.Json,
 		ToType:   pgtypes.JsonB,
 		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
-			return targetType.IoInput(ctx, val.(string))
+			switch v := val.(type) {
+			case sql.StringWrapper:
+				result, err := v.Unwrap(ctx)
+				if err != nil {
+					return nil, err
+				}
+				return targetType.IoInput(ctx, result)
+			case string:
+				return targetType.IoInput(ctx, v)
+			case sql.JSONWrapper:
+				return v, nil
+			default:
+				return nil, errors.Errorf("unexpected JSON value type: %T", val)
+			}
 		},
 	})
 }