Copilot commented on code in PR #4369:
URL: https://github.com/apache/texera/pull/4369#discussion_r3070389216


##########
common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/scan/file/InputFileScanSourceOpDesc.scala:
##########
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+
+package org.apache.texera.amber.operator.source.scan.file
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.kjetland.jackson.jsonSchema.annotations.{
+  JsonSchemaInject,
+  JsonSchemaString,
+  JsonSchemaTitle
+}
+import org.apache.texera.amber.core.executor.OpExecWithClassName
+import org.apache.texera.amber.core.tuple.{AttributeType, Schema}
+import org.apache.texera.amber.core.virtualidentity.{ExecutionIdentity, 
WorkflowIdentity}
+import org.apache.texera.amber.core.workflow.{
+  InputPort,
+  OutputPort,
+  PhysicalOp,
+  SchemaPropagationFunc
+}
+import org.apache.texera.amber.operator.metadata.annotations.HideAnnotation
+import org.apache.texera.amber.operator.metadata.{OperatorGroupConstants, 
OperatorInfo}
+import org.apache.texera.amber.operator.source.SourceOperatorDescriptor
+import org.apache.texera.amber.operator.source.scan.FileDecodingMethod
+import org.apache.texera.amber.operator.source.scan.text.TextSourceOpDesc
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+
+class InputFileScanSourceOpDesc extends SourceOperatorDescriptor with 
TextSourceOpDesc {
+  @JsonProperty(defaultValue = "UTF_8", required = true)
+  @JsonSchemaTitle("Encoding")
+  var fileEncoding: FileDecodingMethod = FileDecodingMethod.UTF_8
+
+  @JsonProperty(defaultValue = "false")
+  @JsonSchemaTitle("Extract")
+  val extract: Boolean = false
+
+  @JsonProperty(defaultValue = "false")
+  @JsonSchemaTitle("Include Filename")
+  @JsonSchemaInject(
+    strings = Array(
+      new JsonSchemaString(path = HideAnnotation.hideTarget, value = 
"extract"),
+      new JsonSchemaString(path = HideAnnotation.hideType, value = 
HideAnnotation.Type.equals),
+      new JsonSchemaString(path = HideAnnotation.hideExpectedValue, value = 
"false")
+    )
+  )
+  val outputFileName: Boolean = false
+
+  override def getPhysicalOp(
+      workflowId: WorkflowIdentity,
+      executionId: ExecutionIdentity
+  ): PhysicalOp = {
+    PhysicalOp
+      .sourcePhysicalOp(
+        workflowId,
+        executionId,
+        operatorIdentifier,
+        OpExecWithClassName(
+          
"org.apache.texera.amber.operator.source.scan.file.InputFileScanSourceOpExec",
+          objectMapper.writeValueAsString(this)
+        )

Review Comment:
   `getPhysicalOp` uses an `OpExecWithClassName` string that points to 
`org.apache.texera.amber.operator.source.scan.InputFileScanSourceOpExec`, but 
the executor added in this PR is in package 
`org.apache.texera.amber.operator.source.scan.file`. As written, workflow 
execution will fail at runtime when the engine tries to instantiate the 
operator executor. Update the fully-qualified class name to the actual executor 
class’ package/name.



##########
common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/scan/file/InputFileScanSourceOpDesc.scala:
##########
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+
+package org.apache.texera.amber.operator.source.scan.file
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.kjetland.jackson.jsonSchema.annotations.{
+  JsonSchemaInject,
+  JsonSchemaString,
+  JsonSchemaTitle
+}
+import org.apache.texera.amber.core.executor.OpExecWithClassName
+import org.apache.texera.amber.core.tuple.{AttributeType, Schema}
+import org.apache.texera.amber.core.virtualidentity.{ExecutionIdentity, 
WorkflowIdentity}
+import org.apache.texera.amber.core.workflow.{
+  InputPort,
+  OutputPort,
+  PhysicalOp,
+  SchemaPropagationFunc
+}
+import org.apache.texera.amber.operator.metadata.annotations.HideAnnotation
+import org.apache.texera.amber.operator.metadata.{OperatorGroupConstants, 
OperatorInfo}
+import org.apache.texera.amber.operator.source.SourceOperatorDescriptor
+import org.apache.texera.amber.operator.source.scan.FileDecodingMethod
+import org.apache.texera.amber.operator.source.scan.text.TextSourceOpDesc
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+
+class InputFileScanSourceOpDesc extends SourceOperatorDescriptor with 
TextSourceOpDesc {
+  @JsonProperty(defaultValue = "UTF_8", required = true)
+  @JsonSchemaTitle("Encoding")
+  var fileEncoding: FileDecodingMethod = FileDecodingMethod.UTF_8
+
+  @JsonProperty(defaultValue = "false")
+  @JsonSchemaTitle("Extract")
+  val extract: Boolean = false
+
+  @JsonProperty(defaultValue = "false")
+  @JsonSchemaTitle("Include Filename")
+  @JsonSchemaInject(
+    strings = Array(
+      new JsonSchemaString(path = HideAnnotation.hideTarget, value = 
"extract"),
+      new JsonSchemaString(path = HideAnnotation.hideType, value = 
HideAnnotation.Type.equals),
+      new JsonSchemaString(path = HideAnnotation.hideExpectedValue, value = 
"false")
+    )
+  )
+  val outputFileName: Boolean = false
+
+  override def getPhysicalOp(
+      workflowId: WorkflowIdentity,
+      executionId: ExecutionIdentity
+  ): PhysicalOp = {
+    PhysicalOp
+      .sourcePhysicalOp(
+        workflowId,
+        executionId,
+        operatorIdentifier,
+        OpExecWithClassName(
+          
"org.apache.texera.amber.operator.source.scan.file.InputFileScanSourceOpExec",
+          objectMapper.writeValueAsString(this)
+        )
+      )
+      .withInputPorts(operatorInfo.inputPorts)
+      .withOutputPorts(operatorInfo.outputPorts)
+      .withPropagateSchema(
+        SchemaPropagationFunc(_ => Map(operatorInfo.outputPorts.head.id -> 
sourceSchema()))
+      )
+  }

Review Comment:
   `getPhysicalOp` builds a `sourcePhysicalOp`, but this operator declares a 
non-empty `inputPorts` list and its executor consumes upstream tuples. 
`PhysicalOp.sourcePhysicalOp` is documented/implemented for true sources (no 
input ports, pinned to controller, 1 worker). Consider using 
`PhysicalOp.oneToOnePhysicalOp` (or an appropriate non-source physical op 
factory) so planning/execution semantics match the operator’s actual behavior 
and avoid unnecessarily forcing controller placement / single-worker execution.



##########
common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/scan/file/InputFileScanSourceOpExec.scala:
##########
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+package org.apache.texera.amber.operator.source.scan.file
+
+import org.apache.texera.amber.core.executor.OperatorExecutor
+import org.apache.texera.amber.core.storage.FileResolver
+import org.apache.texera.amber.core.tuple.{Tuple, TupleLike}
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+
+class InputFileScanSourceOpExec private[scan] (
+    descString: String
+) extends OperatorExecutor {
+  private val desc: InputFileScanSourceOpDesc =
+    objectMapper.readValue(descString, classOf[InputFileScanSourceOpDesc])
+
+  override def processTuple(tuple: Tuple, port: Int): Iterator[TupleLike] = {
+    val fileName =
+      FileResolver.resolve(tuple.getFields.collectFirst { case s: String => s 
}.get).toASCIIString

Review Comment:
   New operator `InputFileScanSourceOpDesc`/`InputFileScanSourceOpExec` 
introduces new behavior (extracting file paths from upstream tuples and 
resolving them), but there doesn’t appear to be an accompanying unit test 
similar to the existing `FileScanSourceOp*Spec`s. Adding a focused test (e.g., 
with a temp file path tuple, plus a negative case for non-string / missing 
fields) would help prevent regressions.
   ```suggestion
       val inputFilePath = tuple.getFields.collectFirst { case s: String => s 
}.getOrElse {
         throw new IllegalArgumentException(
           s"InputFileScanSourceOpExec requires at least one string field 
containing a file path, but received tuple fields: 
${tuple.getFields.mkString("[", ", ", "]")}"
         )
       }
       val fileName = FileResolver.resolve(inputFilePath).toASCIIString
   ```



##########
common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/source/scan/file/InputFileScanSourceOpExec.scala:
##########
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+package org.apache.texera.amber.operator.source.scan.file
+
+import org.apache.texera.amber.core.executor.OperatorExecutor
+import org.apache.texera.amber.core.storage.FileResolver
+import org.apache.texera.amber.core.tuple.{Tuple, TupleLike}
+import org.apache.texera.amber.util.JSONUtils.objectMapper
+
+class InputFileScanSourceOpExec private[scan] (
+    descString: String
+) extends OperatorExecutor {
+  private val desc: InputFileScanSourceOpDesc =
+    objectMapper.readValue(descString, classOf[InputFileScanSourceOpDesc])
+
+  override def processTuple(tuple: Tuple, port: Int): Iterator[TupleLike] = {
+    val fileName =
+      FileResolver.resolve(tuple.getFields.collectFirst { case s: String => s 
}.get).toASCIIString

Review Comment:
   `tuple.getFields.collectFirst { case s: String => s }.get` will throw 
`NoSuchElementException` if the input tuple has no String fields, and it can 
silently pick the wrong field if the tuple contains multiple String attributes. 
Prefer explicitly reading a specific field (e.g., first field or a configured 
attribute name) and return a clear error if it’s missing or not a String.
   ```suggestion
       val inputFilePath = tuple.getFields.headOption match {
         case Some(filePath: String) => filePath
         case Some(value) =>
           throw new IllegalArgumentException(
             s"Expected the first input tuple field to be a String file path, 
but found ${value.getClass.getSimpleName}."
           )
         case None =>
           throw new IllegalArgumentException(
             "Expected the input tuple to contain a file path in the first 
field, but the tuple has no fields."
           )
       }
       val fileName = FileResolver.resolve(inputFilePath).toASCIIString
   ```



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