diff --git a/flow/connectors/bigquery/bigquery.go b/flow/connectors/bigquery/bigquery.go
index 2d1eacd029..0f8bcd99cc 100644
--- a/flow/connectors/bigquery/bigquery.go
+++ b/flow/connectors/bigquery/bigquery.go
@@ -587,6 +587,7 @@ func (c *BigQueryConnector) NormalizeRecords(req *model.NormalizeRecordsRequest)
 		c.datasetID, rawTableName, distinctTableNames))
 
 	for _, tableName := range distinctTableNames {
+		unchangedToastColumns := tableNametoUnchangedToastCols[tableName]
 		dstDatasetTable, _ := c.convertToDatasetTable(tableName)
 		mergeGen := &mergeStmtGenerator{
 			rawDatasetTable: &datasetTable{
@@ -598,7 +599,6 @@ func (c *BigQueryConnector) NormalizeRecords(req *model.NormalizeRecordsRequest)
 			normalizedTableSchema: c.tableNameSchemaMapping[tableName],
 			syncBatchID:           batchIDs.SyncBatchID,
 			normalizeBatchID:      batchIDs.NormalizeBatchID,
-			unchangedToastColumns: tableNametoUnchangedToastCols[tableName],
 			peerdbCols: &protos.PeerDBColumns{
 				SoftDeleteColName: req.SoftDeleteColName,
 				SyncedAtColName:   req.SyncedAtColName,
@@ -607,7 +607,7 @@ func (c *BigQueryConnector) NormalizeRecords(req *model.NormalizeRecordsRequest)
 			shortColumn: map[string]string{},
 		}
 		// normalize anything between last normalized batch id to last sync batchid
-		mergeStmts := mergeGen.generateMergeStmts()
+		mergeStmts := mergeGen.generateMergeStmts(unchangedToastColumns)
 		for i, mergeStmt := range mergeStmts {
 			c.logger.Info(fmt.Sprintf("running merge statement [%d/%d] for table %s..",
 				i+1, len(mergeStmts), tableName))
diff --git a/flow/connectors/bigquery/merge_stmt_generator.go b/flow/connectors/bigquery/merge_stmt_generator.go
index d93e31ad89..eb861b4570 100644
--- a/flow/connectors/bigquery/merge_stmt_generator.go
+++ b/flow/connectors/bigquery/merge_stmt_generator.go
@@ -23,8 +23,6 @@ type mergeStmtGenerator struct {
 	normalizeBatchID int64
 	// the schema of the table to merge into
 	normalizedTableSchema *protos.TableSchema
-	// array of toast column combinations that are unchanged
-	unchangedToastColumns []string
 	// _PEERDB_IS_DELETED and _SYNCED_AT columns
 	peerdbCols *protos.PeerDBColumns
 	// map for shorter columns
@@ -139,7 +137,7 @@ func (m *mergeStmtGenerator) generateMergeStmt(unchangedToastColumns []string) s
 	insertColumnsSQL := csep + fmt.Sprintf(", `%s`", m.peerdbCols.SyncedAtColName)
 	insertValuesSQL := shortCsep + ",CURRENT_TIMESTAMP"
 
-	updateStatementsforToastCols := m.generateUpdateStatements(pureColNames)
+	updateStatementsforToastCols := m.generateUpdateStatements(pureColNames, unchangedToastColumns)
 	if m.peerdbCols.SoftDelete {
 		softDeleteInsertColumnsSQL := insertColumnsSQL + fmt.Sprintf(",`%s`", m.peerdbCols.SoftDeleteColName)
 		softDeleteInsertValuesSQL := insertValuesSQL + ",TRUE"
@@ -180,11 +178,11 @@ func (m *mergeStmtGenerator) generateMergeStmt(unchangedToastColumns []string) s
 		pkeySelectSQL, insertColumnsSQL, insertValuesSQL, updateStringToastCols, deletePart)
 }
 
-func (m *mergeStmtGenerator) generateMergeStmts() []string {
+func (m *mergeStmtGenerator) generateMergeStmts(allUnchangedToastColas []string) []string {
 	// TODO (kaushik): This is so that the statement size for individual merge statements
 	// doesn't exceed the limit. We should make this configurable.
 	const batchSize = 8
-	partitions := utils.ArrayChunks(m.unchangedToastColumns, batchSize)
+	partitions := utils.ArrayChunks(allUnchangedToastColas, batchSize)
 
 	mergeStmts := make([]string, 0, len(partitions))
 	for _, partition := range partitions {
@@ -209,17 +207,17 @@ and updating the other columns (not the unchanged toast columns)
 6. Repeat steps 1-5 for each unique unchanged toast column group.
 7. Return the list of generated update statements.
 */
-func (m *mergeStmtGenerator) generateUpdateStatements(allCols []string) []string {
+func (m *mergeStmtGenerator) generateUpdateStatements(allCols []string, unchangedToastColumns []string) []string {
 	handleSoftDelete := m.peerdbCols.SoftDelete && (m.peerdbCols.SoftDeleteColName != "")
 	// weird way of doing it but avoids prealloc lint
 	updateStmts := make([]string, 0, func() int {
 		if handleSoftDelete {
-			return 2 * len(m.unchangedToastColumns)
+			return 2 * len(unchangedToastColumns)
 		}
-		return len(m.unchangedToastColumns)
+		return len(unchangedToastColumns)
 	}())
 
-	for _, cols := range m.unchangedToastColumns {
+	for _, cols := range unchangedToastColumns {
 		unchangedColsArray := strings.Split(cols, ",")
 		otherCols := utils.ArrayMinus(allCols, unchangedColsArray)
 		tmpArray := make([]string, 0, len(otherCols))
diff --git a/flow/connectors/bigquery/merge_stmt_generator_test.go b/flow/connectors/bigquery/merge_stmt_generator_test.go
index cc49b17cbd..55759f6d39 100644
--- a/flow/connectors/bigquery/merge_stmt_generator_test.go
+++ b/flow/connectors/bigquery/merge_stmt_generator_test.go
@@ -12,7 +12,6 @@ func TestGenerateUpdateStatement(t *testing.T) {
 	allCols := []string{"col1", "col2", "col3"}
 	unchangedToastCols := []string{""}
 	m := &mergeStmtGenerator{
-		unchangedToastColumns: unchangedToastCols,
 		shortColumn: map[string]string{
 			"col1": "_c0",
 			"col2": "_c1",
@@ -35,7 +34,7 @@ func TestGenerateUpdateStatement(t *testing.T) {
 			"`synced_at`=CURRENT_TIMESTAMP",
 	}
 
-	result := m.generateUpdateStatements(allCols)
+	result := m.generateUpdateStatements(allCols, unchangedToastCols)
 
 	for i := range expected {
 		expected[i] = utils.RemoveSpacesTabsNewlines(expected[i])
@@ -51,7 +50,6 @@ func TestGenerateUpdateStatement_WithSoftDelete(t *testing.T) {
 	allCols := []string{"col1", "col2", "col3"}
 	unchangedToastCols := []string{""}
 	m := &mergeStmtGenerator{
-		unchangedToastColumns: unchangedToastCols,
 		shortColumn: map[string]string{
 			"col1": "_c0",
 			"col2": "_c1",
@@ -79,7 +77,7 @@ func TestGenerateUpdateStatement_WithSoftDelete(t *testing.T) {
 			"`col3`=_d._c2,`synced_at`=CURRENT_TIMESTAMP,`deleted`=TRUE",
 	}
 
-	result := m.generateUpdateStatements(allCols)
+	result := m.generateUpdateStatements(allCols, unchangedToastCols)
 
 	for i := range expected {
 		expected[i] = utils.RemoveSpacesTabsNewlines(expected[i])
@@ -100,7 +98,6 @@ func TestGenerateUpdateStatement_WithUnchangedToastCols(t *testing.T) {
 			"col2": "_c1",
 			"col3": "_c2",
 		},
-		unchangedToastColumns: unchangedToastCols,
 		peerdbCols: &protos.PeerDBColumns{
 			SoftDelete:        false,
 			SoftDeleteColName: "deleted",
@@ -123,7 +120,7 @@ func TestGenerateUpdateStatement_WithUnchangedToastCols(t *testing.T) {
 			"`col2`=_d._c1,`synced_at`=CURRENT_TIMESTAMP",
 	}
 
-	result := m.generateUpdateStatements(allCols)
+	result := m.generateUpdateStatements(allCols, unchangedToastCols)
 
 	for i := range expected {
 		expected[i] = utils.RemoveSpacesTabsNewlines(expected[i])
@@ -144,7 +141,6 @@ func TestGenerateUpdateStatement_WithUnchangedToastColsAndSoftDelete(t *testing.
 			"col2": "_c1",
 			"col3": "_c2",
 		},
-		unchangedToastColumns: unchangedToastCols,
 		peerdbCols: &protos.PeerDBColumns{
 			SoftDelete:        true,
 			SoftDeleteColName: "deleted",
@@ -180,7 +176,7 @@ func TestGenerateUpdateStatement_WithUnchangedToastColsAndSoftDelete(t *testing.
 			"`col2`=_d._c1,`synced_at`=CURRENT_TIMESTAMP,`deleted`=TRUE",
 	}
 
-	result := m.generateUpdateStatements(allCols)
+	result := m.generateUpdateStatements(allCols, unchangedToastCols)
 
 	for i := range expected {
 		expected[i] = utils.RemoveSpacesTabsNewlines(expected[i])