Fixes Issue #2549

server/cast/int32.go

@@ -15,6 +15,9 @@
 package cast
 
 import (
+	"strconv"
+	"strings"
+
 	"github.com/cockroachdb/apd/v3"
 	"github.com/cockroachdb/errors"
 	"github.com/dolthub/go-mysql-server/sql"
@@ -34,6 +37,24 @@ func initInt32(builtInCasts map[id.Cast]casts.Cast) {
 
 // int32Explicit registers all explicit casts. This comprises only the source types.
 func int32Explicit(builtInCasts map[id.Cast]casts.Cast) {
+	framework.MustAddExplicitTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Int32,
+		ToType:   pgtypes.Bit,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			width := 1
+			if attTypMod := targetType.GetAttTypMod(); attTypMod != -1 {
+				width = int(attTypMod)
+			}
+			bitStr := strconv.FormatInt(int64(val.(int32)), 2)
+			if len(bitStr) > width {
+				return bitStr[len(bitStr)-width:], nil
+			} else if len(bitStr) < width {
+				return strings.Repeat("0", width-len(bitStr)) + bitStr, nil
+			} else {
+				return bitStr, nil
+			}
+		},
+	})
 	framework.MustAddExplicitTypeCast(builtInCasts, framework.TypeCast{
 		FromType: pgtypes.Int32,
 		ToType:   pgtypes.Bool,

testing/go/pgcatalog_test.go

@@ -484,7 +484,7 @@ func TestPgCast(t *testing.T) {
 			Assertions: []ScriptTestAssertion{
 				{
 					Query:    `SELECT COUNT(*) FROM "pg_catalog"."pg_cast";`,
-					Expected: []sql.Row{{117}},
+					Expected: []sql.Row{{118}},
 				},
 				{ // Different cases and quoted, so it fails
 					Query:       `SELECT * FROM "PG_catalog"."pg_cast";`,
@@ -496,7 +496,7 @@ func TestPgCast(t *testing.T) {
 				},
 				{ // Different cases but non-quoted, so it works
 					Query:    "SELECT COUNT(*) FROM PG_catalog.pg_CAST ORDER BY oid;",
-					Expected: []sql.Row{{117}},
+					Expected: []sql.Row{{118}},
 				},
 			},
 		},
@@ -5082,7 +5082,7 @@ ORDER BY 1;`,
 				{
 					// This is to make sure a full range scan works (we don't support a full range scan on the index yet)
 					Query:    `SELECT relname from pg_catalog.pg_class order by oid limit 1;`,
-					Expected: []sql.Row{sql.Row{"pg_publication_namespace"}},
+					Expected: []sql.Row{{"pg_publication_namespace"}},
 				},
 				{
 					Query: `EXPLAIN SELECT c.oid
@@ -6045,9 +6045,9 @@ func TestSystemTablesInPgcatalog(t *testing.T) {
 						{245736992, "dolt_conflicts", 2200, "r"},
 						{1932298159, "dolt_constraint_violations", 2200, "r"},
 						{2357712556, "dolt_diff", 2200, "r"},
-						sql.Row{101228732, "dolt_diff_commit_hash_key", 2200, "i"},
+						{101228732, "dolt_diff_commit_hash_key", 2200, "i"},
 						{3491847678, "dolt_log", 2200, "r"},
-						sql.Row{2292720014, "dolt_log_commit_hash_key", 2200, "i"},
+						{2292720014, "dolt_log_commit_hash_key", 2200, "i"},
 						{604995978, "dolt_merge_status", 2200, "r"},
 						{887648921, "dolt_remote_branches", 2200, "r"},
 						{1471391189, "dolt_remote_branches_dolt_branches_name_idx_key", 2200, "i"},

testing/go/types_test.go

@@ -95,6 +95,27 @@ var typesTests = []ScriptTest{
 					{2, pgtype.Bits{Bytes: []uint8{0x2b}, Len: 8, Valid: true}, pgtype.Bits{Bytes: []uint8{0x0}, Len: 3, Valid: true}},
 				},
 			},
+			{
+				Query: "SELECT 0::bit, 1::bit, 2::bit, 3::bit, 4::bit, 5::bit(2), 6::bit(2);",
+				Expected: []sql.Row{{
+					pgtype.Bits{Bytes: []uint8{0x00}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x80}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x00}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x80}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x00}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x40}, Len: 2, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x80}, Len: 2, Valid: true},
+				}},
+			},
+			{
+				Query: "SELECT (-1)::bit, (-2)::bit, (-5)::bit(2), (-6::int4)::bit(2);",
+				Expected: []sql.Row{{
+					pgtype.Bits{Bytes: []uint8{0x80}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x00}, Len: 1, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x40}, Len: 2, Valid: true},
+					pgtype.Bits{Bytes: []uint8{0x80}, Len: 2, Valid: true},
+				}},
+			},
 			{
 				Query:       "INSERT INTO t_bit VALUES (3, B'101', '111');",
 				ExpectedErr: "bit string length 3 does not match type bit(8)",