diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/PushValueAccessAndFilterDownRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/PushValueAccessAndFilterDownRule.java
index 3b298d0..c74c293 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/PushValueAccessAndFilterDownRule.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/PushValueAccessAndFilterDownRule.java
@@ -113,11 +113,11 @@
             pushdownProcessorsExecutor.add(new ColumnFilterPushdownProcessor(pushdownContext, context));
             // Performs range-filter pushdowns
             pushdownProcessorsExecutor.add(new ColumnRangeFilterPushdownProcessor(pushdownContext, context));
-            // Performs prefix pushdowns
-            pushdownProcessorsExecutor.add(new ExternalDatasetFilterPushdownProcessor(pushdownContext, context));
-            // Inlines AND/OR expression (must be last to run)
-            pushdownProcessorsExecutor.add(new InlineFilterExpressionsProcessor(pushdownContext, context));
         }
+        // Performs prefix pushdowns
+        pushdownProcessorsExecutor.add(new ExternalDatasetFilterPushdownProcessor(pushdownContext, context));
+        // Inlines AND/OR expression (must be last to run)
+        pushdownProcessorsExecutor.add(new InlineFilterExpressionsProcessor(pushdownContext, context));
     }
 
     /**
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/PushdownProcessorsExecutor.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/PushdownProcessorsExecutor.java
index 1530f55..ab6a26c 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/PushdownProcessorsExecutor.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/PushdownProcessorsExecutor.java
@@ -67,7 +67,8 @@
             if (dataset.getDatasetFormatInfo().getFormat() == DatasetConfig.DatasetFormat.COLUMN) {
                 info = createInternalColumnarDatasetInfo(scanDefineDescriptor, context);
             } else if (dataset.getDatasetType() == DatasetConfig.DatasetType.EXTERNAL
-                    && DatasetUtil.isFieldAccessPushdownSupported(dataset)) {
+                    && (DatasetUtil.isFieldAccessPushdownSupported(dataset)
+                            || DatasetUtil.isFilterPushdownSupported(dataset))) {
                 info = createExternalDatasetProjectionInfo(scanDefineDescriptor, context);
             }
             setInfoToDataScan(scanOp, info);
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/visitor/PushdownOperatorVisitor.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/visitor/PushdownOperatorVisitor.java
index 65b131a..dd9acd5 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/visitor/PushdownOperatorVisitor.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/pushdown/visitor/PushdownOperatorVisitor.java
@@ -26,13 +26,11 @@
 import org.apache.asterix.common.config.DatasetConfig;
 import org.apache.asterix.common.config.DatasetConfig.DatasetFormat;
 import org.apache.asterix.common.metadata.DataverseName;
-import org.apache.asterix.external.util.ExternalDataUtils;
 import org.apache.asterix.metadata.declared.DataSource;
 import org.apache.asterix.metadata.declared.DataSourceId;
 import org.apache.asterix.metadata.declared.DatasetDataSource;
 import org.apache.asterix.metadata.declared.MetadataProvider;
 import org.apache.asterix.metadata.entities.Dataset;
-import org.apache.asterix.metadata.entities.ExternalDatasetDetails;
 import org.apache.asterix.om.functions.BuiltinFunctions;
 import org.apache.asterix.om.utils.ConstantExpressionUtil;
 import org.apache.asterix.optimizer.rules.pushdown.PushdownContext;
@@ -202,11 +200,8 @@
 
         Dataset dataset = getDataset(dataSource);
         //Only external dataset can have pushed down expressions
-        if (dataset.getDatasetType() == DatasetConfig.DatasetType.EXTERNAL
-                && !ExternalDataUtils
-                        .supportsPushdown(((ExternalDatasetDetails) dataset.getDatasetDetails()).getProperties())
-                || dataset.getDatasetType() == DatasetConfig.DatasetType.INTERNAL
-                        && dataset.getDatasetFormatInfo().getFormat() == DatasetFormat.ROW) {
+        if (dataset.getDatasetType() == DatasetConfig.DatasetType.INTERNAL
+                && dataset.getDatasetFormatInfo().getFormat() == DatasetFormat.ROW) {
             return null;
         }
 
diff --git a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/util/ExternalDataPrefix.java b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/util/ExternalDataPrefix.java
index 899a179..ec56009 100644
--- a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/util/ExternalDataPrefix.java
+++ b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/util/ExternalDataPrefix.java
@@ -21,6 +21,7 @@
 
 import static org.apache.asterix.external.util.ExternalDataConstants.COMPUTED_FIELD_PATTERN;
 import static org.apache.asterix.external.util.ExternalDataConstants.DEFINITION_FIELD_NAME;
+import static org.apache.asterix.external.util.ExternalDataConstants.KEY_PATH;
 import static org.apache.asterix.external.util.ExternalDataConstants.PREFIX_DEFAULT_DELIMITER;
 
 import java.util.ArrayList;
@@ -68,7 +69,7 @@
     }
 
     public ExternalDataPrefix(Map<String, String> configuration) throws AlgebricksException {
-        this(configuration.get(DEFINITION_FIELD_NAME));
+        this(getDefinitionOrPath(configuration));
     }
 
     public ExternalDataPrefix(String prefix) throws AlgebricksException {
@@ -245,4 +246,8 @@
 
         return values;
     }
+
+    private static String getDefinitionOrPath(Map<String, String> configuration) {
+        return configuration.getOrDefault(DEFINITION_FIELD_NAME, configuration.get(KEY_PATH));
+    }
 }
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/utils/DatasetUtil.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/utils/DatasetUtil.java
index 88eafcd..44964f3 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/utils/DatasetUtil.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/utils/DatasetUtil.java
@@ -699,8 +699,8 @@
         if (dataset.getDatasetType() == DatasetType.INTERNAL) {
             return dataset.getDatasetFormatInfo().getFormat() == DatasetConfig.DatasetFormat.COLUMN;
         }
-        // TODO add external dataset with dynamic prefixes
-        return false;
+        // External dataset support filter pushdown
+        return true;
     }
 
     public static boolean isRangeFilterPushdownSupported(Dataset dataset) {