Updated String Expression Factory Type to BigQuery SQL

Author: fernst

src/main/java/io/cdap/plugin/gcp/bigquery/relational/SQLExpressionFactory.java

@@ -29,7 +29,7 @@ public class SQLExpressionFactory implements ExpressionFactory<String> {
    */
   @Override
   public ExpressionFactoryType<String> getType() {
-    return StringExpressionFactoryType.SQL;
+    return StringExpressionFactoryType.BIGQUERY_SQL;
   }
 
   /**
@@ -50,7 +50,7 @@ public Expression compile(String expression) {
    */
   @Override
   public Set<Capability> getCapabilities() {
-    return new HashSet<>(Arrays.asList(StringExpressionFactoryType.SQL,
+    return new HashSet<>(Arrays.asList(StringExpressionFactoryType.BIGQUERY_SQL,
                                        CoreExpressionCapabilities.CAN_GET_QUALIFIED_DATASET_NAME,
                                        CoreExpressionCapabilities.CAN_GET_QUALIFIED_COLUMN_NAME,
                                        CoreExpressionCapabilities.CAN_SET_DATASET_ALIAS));

src/main/java/io/cdap/plugin/gcp/bigquery/sqlengine/BigQuerySQLEngine.java

@@ -420,7 +420,7 @@ public void cleanup(String datasetName) throws SQLEngineException {
    */
   @Override
   public Set<Capability> getCapabilities() {
-    return Collections.singleton(StringExpressionFactoryType.SQL);
+    return Collections.singleton(StringExpressionFactoryType.BIGQUERY_SQL);
   }
 
   /**