[ASTERIXDB-3292][EXT]: Fail if duplicate computed fields are used

Change-Id: I3f11c583268fe759e3fd95408ec75eeea5529b99
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/17889
Reviewed-by: Wail Alkowaileet <wael.y.k@gmail.com>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.000.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.000.ddl.sqlpp
new file mode 100644
index 0000000..0e265e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.000.ddl.sqlpp
@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+DROP DATAVERSE test IF EXISTS;
+CREATE DATAVERSE test;
+USE test;
+
+CREATE TYPE test AS {
+};
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.001.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.001.ddl.sqlpp
new file mode 100644
index 0000000..fb6decb
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.001.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="foo-{year:int}-{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="json")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.002.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.002.ddl.sqlpp
new file mode 100644
index 0000000..615da54
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.002.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{year:int}/{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="json")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.003.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.003.ddl.sqlpp
new file mode 100644
index 0000000..851f82d
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.003.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{year:int}/foo/{month:int}/{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="json")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.004.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.004.ddl.sqlpp
new file mode 100644
index 0000000..bd8486c
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.004.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{month:int}/foo/{day:int}/{year:int}-{year:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="json")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.005.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.005.ddl.sqlpp
new file mode 100644
index 0000000..1c6fa81
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.005.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{a.b:int}/foo/{a.b.c:int}/{a.b.c.d:int}-{a.b.c.d:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="json")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.999.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.999.ddl.sqlpp
new file mode 100644
index 0000000..36b2bab
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/duplicate-field/test.999.ddl.sqlpp
@@ -0,0 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+DROP DATAVERSE test IF EXISTS;
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.000.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.000.ddl.sqlpp
new file mode 100644
index 0000000..0e265e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.000.ddl.sqlpp
@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+DROP DATAVERSE test IF EXISTS;
+CREATE DATAVERSE test;
+USE test;
+
+CREATE TYPE test AS {
+};
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.001.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.001.ddl.sqlpp
new file mode 100644
index 0000000..8fc72c6
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.001.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="foo-{year:int}-{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="parquet")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.002.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.002.ddl.sqlpp
new file mode 100644
index 0000000..c386689
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.002.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{year:int}/{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="parquet")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.003.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.003.ddl.sqlpp
new file mode 100644
index 0000000..eeb34b0
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.003.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{year:int}/foo/{month:int}/{year:int}-{day:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="parquet")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.004.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.004.ddl.sqlpp
new file mode 100644
index 0000000..42673d0
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.004.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{month:int}/foo/{day:int}/{year:int}-{year:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="parquet")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.005.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.005.ddl.sqlpp
new file mode 100644
index 0000000..0e1157f
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.005.ddl.sqlpp
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+USE test;
+
+CREATE EXTERNAL DATASET test1(test) USING %adapter% (
+    %template%,
+    ("container"="dynamic-prefix-at-start-container"),
+    ("definition"="{a.b:int}/foo/{a.b.c:int}/{a.b.c.d:int}-{a.b.c.d:int}/"),
+    ("embed-filter-values" = "true"),
+    ("format"="parquet")
+);
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.999.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.999.ddl.sqlpp
new file mode 100644
index 0000000..36b2bab
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-dataset/common/dynamic-prefixes/parquet/duplicate-field/test.999.ddl.sqlpp
@@ -0,0 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+DROP DATAVERSE test IF EXISTS;
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_azure_blob_storage.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_azure_blob_storage.xml
index acf7693..7322b1a 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_azure_blob_storage.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_azure_blob_storage.xml
@@ -348,6 +348,17 @@
         <output-dir compare="Text">using-limit</output-dir>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="external-dataset/common/dynamic-prefixes">
+      <compilation-unit name="duplicate-field">
+        <placeholder name="adapter" value="AZUREBLOB" />
+        <output-dir compare="Text">duplicate-field</output-dir>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'a.b.c.d'</expected-error>
+      </compilation-unit>
+    </test-case>
     <!-- Dynamic prefixes tests end -->
     <test-case FilePath="external-dataset">
       <compilation-unit name="common/empty-string-definition">
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_s3.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_s3.xml
index 7515996..143881f6 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_s3.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_external_dataset_s3.xml
@@ -323,6 +323,17 @@
         <output-dir compare="Text">views</output-dir>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="external-dataset/common/dynamic-prefixes">
+      <compilation-unit name="duplicate-field">
+        <placeholder name="adapter" value="S3" />
+        <output-dir compare="Text">duplicate-field</output-dir>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'a.b.c.d'</expected-error>
+      </compilation-unit>
+    </test-case>
     <test-case FilePath="external-dataset/common/dynamic-prefixes/parquet">
       <compilation-unit name="one-field">
         <placeholder name="adapter" value="S3" />
@@ -387,6 +398,17 @@
         <output-dir compare="Text">views</output-dir>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="external-dataset/common/dynamic-prefixes/parquet">
+      <compilation-unit name="duplicate-field">
+        <placeholder name="adapter" value="S3" />
+        <output-dir compare="Text">duplicate-field</output-dir>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'year'</expected-error>
+        <expected-error>Duplicate field name 'a.b.c.d'</expected-error>
+      </compilation-unit>
+    </test-case>
     <test-case FilePath="external-dataset/common/dynamic-prefixes/csv">
       <compilation-unit name="embed-one-value">
         <placeholder name="adapter" value="S3" />
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 fc2f372..7eefc8a 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
@@ -154,10 +154,17 @@
                     String namePart = splits[0].substring(1);
                     String typePart = splits[1].substring(0, splits[1].length() - 1);
 
+                    // ensure no duplicate fields
+                    if (computedFieldNames.contains(namePart)) {
+                        throw new CompilationException(ErrorCode.DUPLICATE_FIELD_NAME, namePart);
+                    }
+
+                    // ensure supported type
                     IAType type = BuiltinTypeMap.getBuiltinType(typePart);
                     if (type == null) {
                         throw new CompilationException(ErrorCode.UNSUPPORTED_COMPUTED_FIELD_TYPE, typePart);
                     }
+
                     type = getUpdatedType(type);
                     validateSupported(type.getTypeTag());