diff --git a/.github/workflows/check_make_parser.yml b/.github/workflows/check_make_parser.yml
index c46f5bffc5f..efc6c737e73 100644
--- a/.github/workflows/check_make_parser.yml
+++ b/.github/workflows/check_make_parser.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed" 
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/.github/workflows/cluster_endtoend.yml b/.github/workflows/cluster_endtoend.yml
index 448622241a1..5d31167f707 100644
--- a/.github/workflows/cluster_endtoend.yml
+++ b/.github/workflows/cluster_endtoend.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/.github/workflows/e2e_race.yml b/.github/workflows/e2e_race.yml
index 040639d96b6..2e6fb4f4938 100644
--- a/.github/workflows/e2e_race.yml
+++ b/.github/workflows/e2e_race.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/.github/workflows/endtoend.yml b/.github/workflows/endtoend.yml
index 7a0c594ee35..b10977d4860 100644
--- a/.github/workflows/endtoend.yml
+++ b/.github/workflows/endtoend.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/.github/workflows/local_example.yml b/.github/workflows/local_example.yml
index 496229ade18..b08ce73f886 100644
--- a/.github/workflows/local_example.yml
+++ b/.github/workflows/local_example.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
index 6cfc4d77967..37df2da855a 100644
--- a/.github/workflows/unit.yml
+++ b/.github/workflows/unit.yml
@@ -19,7 +19,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
 
         if [ ${{matrix.name}} = "mysql57" ]; then
           sudo apt-get install -y mysql-server mysql-client
@@ -29,7 +29,7 @@ jobs:
           wget -c https://dev.mysql.com/get/mysql-apt-config_0.8.14-1_all.deb
           echo mysql-apt-config mysql-apt-config/select-server select mysql-8.0 | sudo debconf-set-selections 
           sudo DEBIAN_FRONTEND="noninteractive" dpkg -i mysql-apt-config*
-          sudo apt-get update
+          sudo apt-get update || echo "update failed"
           sudo DEBIAN_FRONTEND="noninteractive" apt-get install -y mysql-server mysql-client
         elif [ ${{matrix.name}} = "mariadb101" ]; then
           sudo apt-get remove -y mysql-server mysql-client
diff --git a/.github/workflows/unit_race.yml b/.github/workflows/unit_race.yml
index 7da452685d8..6f065bf2737 100644
--- a/.github/workflows/unit_race.yml
+++ b/.github/workflows/unit_race.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Get dependencies
       run: |
-        sudo apt-get update
+        sudo apt-get update || echo "update failed"
         sudo apt-get install -y mysql-server mysql-client make unzip g++ etcd curl git wget
         sudo service mysql stop
         sudo service etcd stop
diff --git a/go.mod b/go.mod
index 44d8c461dd1..af52af73134 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,7 @@ require (
 	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
-	github.com/evanphx/json-patch v4.5.0+incompatible // indirect
+	github.com/evanphx/json-patch v4.5.0+incompatible
 	github.com/ghodss/yaml v0.0.0-20161207003320-04f313413ffd // indirect
 	github.com/go-ini/ini v1.12.0 // indirect
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
@@ -45,7 +45,7 @@ require (
 	github.com/klauspost/crc32 v1.2.0 // indirect
 	github.com/klauspost/pgzip v1.2.0
 	github.com/kr/pretty v0.1.0 // indirect
-	github.com/krishicks/yaml-patch v0.0.10 // indirect
+	github.com/krishicks/yaml-patch v0.0.10
 	github.com/mattn/go-runewidth v0.0.1 // indirect
 	github.com/minio/minio-go v0.0.0-20190131015406-c8a261de75c1
 	github.com/mitchellh/go-testing-interface v1.0.0 // indirect
diff --git a/go/mysql/encoding.go b/go/mysql/encoding.go
index c9333522cdf..53b9e2efc73 100644
--- a/go/mysql/encoding.go
+++ b/go/mysql/encoding.go
@@ -281,3 +281,17 @@ func readLenEncStringAsBytes(data []byte, pos int) ([]byte, int, bool) {
 	}
 	return data[pos : pos+s], pos + s, true
 }
+
+func readLenEncStringAsBytesCopy(data []byte, pos int) ([]byte, int, bool) {
+	size, pos, ok := readLenEncInt(data, pos)
+	if !ok {
+		return nil, 0, false
+	}
+	s := int(size)
+	if pos+s-1 >= len(data) {
+		return nil, 0, false
+	}
+	result := make([]byte, size)
+	copy(result, data[pos:pos+s])
+	return result, pos + s, true
+}
diff --git a/go/mysql/encoding_test.go b/go/mysql/encoding_test.go
index 2ca9a84c934..ac38b5c7db0 100644
--- a/go/mysql/encoding_test.go
+++ b/go/mysql/encoding_test.go
@@ -303,6 +303,24 @@ func TestEncString(t *testing.T) {
 			t.Errorf("readLenEncStringAsBytes returned ok=true for empty value %v", test.value)
 		}
 
+		// Check successful decoding as bytes.
+		gotbcopy, posCopy, ok := readLenEncStringAsBytesCopy(test.lenEncoded, 0)
+		if !ok || string(gotb) != test.value || pos != len(test.lenEncoded) {
+			t.Errorf("readLenEncString returned %v/%v/%v but expected %v/%v/%v", gotbcopy, posCopy, ok, test.value, len(test.lenEncoded), true)
+		}
+
+		// Check failed decoding as bytes with shorter data.
+		_, _, ok = readLenEncStringAsBytesCopy(test.lenEncoded[:len(test.lenEncoded)-1], 0)
+		if ok {
+			t.Errorf("readLenEncStringAsBytes returned ok=true for shorter value %v", test.value)
+		}
+
+		// Check failed decoding as bytes with no data.
+		_, _, ok = readLenEncStringAsBytesCopy([]byte{}, 0)
+		if ok {
+			t.Errorf("readLenEncStringAsBytes returned ok=true for empty value %v", test.value)
+		}
+
 		// null encoded tests.
 
 		// Check successful encoding.
diff --git a/go/mysql/query.go b/go/mysql/query.go
index 6ff9d1e9bc0..f6435bf4b64 100644
--- a/go/mysql/query.go
+++ b/go/mysql/query.go
@@ -261,7 +261,7 @@ func (c *Conn) parseRow(data []byte, fields []*querypb.Field) ([]sqltypes.Value,
 		}
 		var s []byte
 		var ok bool
-		s, pos, ok = readLenEncStringAsBytes(data, pos)
+		s, pos, ok = readLenEncStringAsBytesCopy(data, pos)
 		if !ok {
 			return nil, NewSQLError(CRMalformedPacket, SSUnknownSQLState, "decoding string failed")
 		}
@@ -823,7 +823,7 @@ func (c *Conn) parseStmtArgs(data []byte, typ querypb.Type, pos int) (sqltypes.V
 		}
 	case sqltypes.Decimal, sqltypes.Text, sqltypes.Blob, sqltypes.VarChar, sqltypes.VarBinary, sqltypes.Char,
 		sqltypes.Bit, sqltypes.Enum, sqltypes.Set, sqltypes.Geometry, sqltypes.Binary, sqltypes.TypeJSON:
-		val, pos, ok := readLenEncStringAsBytes(data, pos)
+		val, pos, ok := readLenEncStringAsBytesCopy(data, pos)
 		return sqltypes.MakeTrusted(sqltypes.VarBinary, val), pos, ok
 	default:
 		return sqltypes.NULL, pos, false
diff --git a/go/vt/discovery/healthcheck_test.go b/go/vt/discovery/healthcheck_flaky_test.go
similarity index 100%
rename from go/vt/discovery/healthcheck_test.go
rename to go/vt/discovery/healthcheck_flaky_test.go
diff --git a/go/vt/logutil/logutil_test.go b/go/vt/logutil/logutil_flaky_test.go
similarity index 100%
rename from go/vt/logutil/logutil_test.go
rename to go/vt/logutil/logutil_flaky_test.go
diff --git a/go/vt/vtgate/executor.go b/go/vt/vtgate/executor.go
index 7a91df5e65e..63e3a0bdfb2 100644
--- a/go/vt/vtgate/executor.go
+++ b/go/vt/vtgate/executor.go
@@ -845,6 +845,14 @@ func (e *Executor) handleShow(ctx context.Context, safeSession *SafeSession, sql
 				}
 			}
 		}
+	case sqlparser.KeywordString(sqlparser.COLUMNS):
+		if !show.OnTable.Qualifier.IsEmpty() {
+			destKeyspace = show.OnTable.Qualifier.String()
+			show.OnTable.Qualifier = sqlparser.NewTableIdent("")
+		} else {
+			break
+		}
+		sql = sqlparser.String(show)
 	case sqlparser.KeywordString(sqlparser.TABLES):
 		if show.ShowTablesOpt != nil && show.ShowTablesOpt.DbName != "" {
 			if destKeyspace == "" {
diff --git a/go/vt/vtgate/executor_test.go b/go/vt/vtgate/executor_test.go
index 8767cd0928c..8a42e884bc6 100644
--- a/go/vt/vtgate/executor_test.go
+++ b/go/vt/vtgate/executor_test.go
@@ -890,6 +890,13 @@ func TestExecutorShow(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
+
+	// Test SHOW FULL COLUMNS FROM where query has a qualifier
+	_, err = executor.Execute(context.Background(), "TestExecute", session, fmt.Sprintf("show full columns from %v.table1", KsTestUnsharded), nil)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
 	// Just test for first & last.
 	qr.Rows = [][]sqltypes.Value{qr.Rows[0], qr.Rows[len(qr.Rows)-1]}
 	wantqr = &sqltypes.Result{
diff --git a/go/vt/vttablet/tabletmanager/vreplication/vcopier_test.go b/go/vt/vttablet/tabletmanager/vreplication/vcopier_flaky_test.go
similarity index 100%
rename from go/vt/vttablet/tabletmanager/vreplication/vcopier_test.go
rename to go/vt/vttablet/tabletmanager/vreplication/vcopier_flaky_test.go
diff --git a/tools/unit_test_runner.sh b/tools/unit_test_runner.sh
index 4cffb3eb913..879626d7bf7 100755
--- a/tools/unit_test_runner.sh
+++ b/tools/unit_test_runner.sh
@@ -55,6 +55,8 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 
+echo '# Flaky tests (3 attempts permitted)'
+
 # Run flaky tests sequentially. Retry when necessary.
 for pkg in $flaky_tests; do
   max_attempts=3