[ASTERIXDB-3483]: Function Owner changes

- user model changes: no
- storage format changes: no
- interface changes: yes

details:
- Add 'Creator' nested open fields in the function entity.
- Extend methods to pass the creator.
- Add newFunction method.
- This change is backward compatible.

Ext-ref: MB-62971

Change-Id: I4491f53200a20f2598dd9e3a72424f5050076c89
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/18943
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Murtadha Hubail <mhubail@apache.org>
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
index d6bace5..d1d61a0 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
@@ -444,7 +444,8 @@
                         handleAdapterDropStatement(metadataProvider, stmt);
                         break;
                     case CREATE_FUNCTION:
-                        handleCreateFunctionStatement(metadataProvider, stmt, stmtRewriter, requestParameters);
+                        handleCreateFunctionStatement(metadataProvider, stmt, stmtRewriter, requestParameters,
+                                Creator.DEFAULT_CREATOR);
                         break;
                     case FUNCTION_DROP:
                         handleFunctionDropStatement(metadataProvider, stmt, requestParameters);
@@ -3085,7 +3086,7 @@
     }
 
     public void handleCreateFunctionStatement(MetadataProvider metadataProvider, Statement stmt,
-            IStatementRewriter stmtRewriter, IRequestParameters requestParameters) throws Exception {
+            IStatementRewriter stmtRewriter, IRequestParameters requestParameters, Creator creator) throws Exception {
         CreateFunctionStatement cfs = (CreateFunctionStatement) stmt;
         FunctionSignature signature = cfs.getFunctionSignature();
         DataverseName funDataverse = signature.getDataverseName();
@@ -3118,7 +3119,7 @@
         lockUtil.createFunctionBegin(lockManager, metadataProvider.getLocks(), databaseName, dataverseName,
                 signature.getName(), libraryDatabaseName, libraryDataverseName, libraryName);
         try {
-            doCreateFunction(metadataProvider, cfs, signature, stmtRewriter, requestParameters);
+            doCreateFunction(metadataProvider, cfs, signature, stmtRewriter, requestParameters, creator);
         } finally {
             metadataProvider.getLocks().unlock();
             metadataProvider.setDefaultNamespace(activeNamespace);
@@ -3126,8 +3127,8 @@
     }
 
     protected CreateResult doCreateFunction(MetadataProvider metadataProvider, CreateFunctionStatement cfs,
-            FunctionSignature functionSignature, IStatementRewriter stmtRewriter, IRequestParameters requestParameters)
-            throws Exception {
+            FunctionSignature functionSignature, IStatementRewriter stmtRewriter, IRequestParameters requestParameters,
+            Creator creator) throws Exception {
         DataverseName dataverseName = functionSignature.getDataverseName();
         String databaseName = functionSignature.getDatabaseName();
         SourceLocation sourceLoc = cfs.getSourceLocation();
@@ -3244,7 +3245,7 @@
                 function = new Function(functionSignature, paramNames, paramTypes, returnTypeSignature, null,
                         FunctionKind.SCALAR.toString(), library.getLanguage(), libraryDatabaseName,
                         libraryDataverseName, libraryName, externalIdentifier, cfs.getNullCall(),
-                        cfs.getDeterministic(), cfs.getResources(), dependencies);
+                        cfs.getDeterministic(), cfs.getResources(), dependencies, creator);
             } else {
                 List<Pair<VarIdentifier, TypeExpression>> paramList = cfs.getParameters();
                 int paramCount = paramList.size();
@@ -3283,7 +3284,7 @@
                 newInlineTypes = Collections.emptyMap();
                 function = new Function(functionSignature, paramNames, null, null, cfs.getFunctionBody(),
                         FunctionKind.SCALAR.toString(), compilationProvider.getParserFactory().getLanguage(), null,
-                        null, null, null, null, null, null, dependencies);
+                        null, null, null, null, null, null, dependencies, creator);
             }
 
             if (existingFunction == null) {
@@ -3309,6 +3310,8 @@
                 }
                 MetadataManager.INSTANCE.updateFunction(mdTxnCtx, function);
             }
+            beforeTxnCommit(metadataProvider, creator,
+                    EntityDetails.newFunction(databaseName, dataverseName, function.getName(), function.getArity()));
             MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
             if (LOGGER.isInfoEnabled()) {
                 LOGGER.info("Installed function: " + functionSignature);
diff --git a/asterixdb/asterix-lang-common/src/main/java/org/apache/asterix/lang/common/util/ExpressionUtils.java b/asterixdb/asterix-lang-common/src/main/java/org/apache/asterix/lang/common/util/ExpressionUtils.java
index eaf9cce..419d677 100644
--- a/asterixdb/asterix-lang-common/src/main/java/org/apache/asterix/lang/common/util/ExpressionUtils.java
+++ b/asterixdb/asterix-lang-common/src/main/java/org/apache/asterix/lang/common/util/ExpressionUtils.java
@@ -296,7 +296,7 @@
                         if (seenFunctions.add(signature)) {
                             String functionName = signature.getName() + "(" + signature.getArity() + ")";
                             metadataProvider.addAccessedEntity(EntityDetails.newFunction(signature.getDatabaseName(),
-                                    signature.getDataverseName(), functionName));
+                                    signature.getDataverseName(), functionName, 0));
                             outFunctionDependencies.add(new DependencyFullyQualifiedName(signature.getDatabaseName(),
                                     signature.getDataverseName(), signature.getName(),
                                     Integer.toString(signature.getArity())));
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/SqlppLoadAccessedDataset.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/SqlppLoadAccessedDataset.java
index 60a7f28..7981d55 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/SqlppLoadAccessedDataset.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/SqlppLoadAccessedDataset.java
@@ -99,8 +99,8 @@
                 return;
             }
             String functionName = signature.getName() + "(" + signature.getArity() + ")";
-            context.getMetadataProvider().addAccessedEntity(
-                    EntityDetails.newFunction(signature.getDatabaseName(), signature.getDataverseName(), functionName));
+            context.getMetadataProvider().addAccessedEntity(EntityDetails.newFunction(signature.getDatabaseName(),
+                    signature.getDataverseName(), functionName, 0));
         }
     }
 }
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/MetadataTransactionContext.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/MetadataTransactionContext.java
index 6077d29..70bf83a 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/MetadataTransactionContext.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/MetadataTransactionContext.java
@@ -203,7 +203,7 @@
 
     public void dropFunction(FunctionSignature signature) {
         Function function = new Function(signature, null, null, null, null, null, null, null, null, null, null, false,
-                false, null, null);
+                false, null, null, null);
         droppedCache.addFunctionIfNotExists(function);
         logAndApply(new MetadataLogicalOperation(function, false));
     }
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/EntityDetails.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/EntityDetails.java
index df44ecf..23353eb 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/EntityDetails.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/EntityDetails.java
@@ -39,7 +39,9 @@
     private final String databaseName;
     private final DataverseName dataverseName;
     private final String entityName;
-    private EntityType entityType;
+    private final EntityType entityType;
+    // The number of arguments that the function accepts. Relevant only for function entity.
+    private int functionArity;
 
     private EntityDetails(String databaseName, DataverseName dataverseName, String entityName, EntityType entityType) {
         this.databaseName = databaseName;
@@ -48,6 +50,15 @@
         this.entityType = entityType;
     }
 
+    private EntityDetails(String databaseName, DataverseName dataverseName, String entityName, EntityType entityType,
+            int functionArity) {
+        this.databaseName = databaseName;
+        this.dataverseName = dataverseName;
+        this.entityName = entityName;
+        this.entityType = entityType;
+        this.functionArity = functionArity;
+    }
+
     public static EntityDetails newDatabase(String databaseName) {
         return new EntityDetails(databaseName, null, null, EntityType.DATABASE);
     }
@@ -64,8 +75,9 @@
         return new EntityDetails(databaseName, dataverseName, viewName, EntityType.VIEW);
     }
 
-    public static EntityDetails newFunction(String databaseName, DataverseName dataverseName, String functionName) {
-        return new EntityDetails(databaseName, dataverseName, functionName, EntityType.FUNCTION);
+    public static EntityDetails newFunction(String databaseName, DataverseName dataverseName, String functionName,
+            int functionArity) {
+        return new EntityDetails(databaseName, dataverseName, functionName, EntityType.FUNCTION, functionArity);
     }
 
     public static EntityDetails newSynonym(String databaseName, DataverseName dataverseName, String synonymName) {
@@ -91,4 +103,8 @@
     public EntityType getEntityType() {
         return entityType;
     }
+
+    public int getFunctionArity() {
+        return functionArity;
+    }
 }
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/Function.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/Function.java
index 82c9514..3c1515b 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/Function.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entities/Function.java
@@ -29,6 +29,7 @@
 import org.apache.asterix.common.metadata.DependencyFullyQualifiedName;
 import org.apache.asterix.metadata.MetadataCache;
 import org.apache.asterix.metadata.api.IMetadataEntity;
+import org.apache.asterix.metadata.utils.Creator;
 import org.apache.asterix.om.types.TypeSignature;
 
 public class Function implements IMetadataEntity<Function> {
@@ -49,12 +50,13 @@
     private final Boolean nullCall; // null for SQL++ and AQL functions
     private final Map<String, String> resources;
     private final List<List<DependencyFullyQualifiedName>> dependencies;
+    private final Creator creator;
 
     public Function(FunctionSignature signature, List<String> paramNames, List<TypeSignature> paramTypes,
             TypeSignature returnType, String functionBody, String functionKind, String language,
             String libraryDatabaseName, DataverseName libraryDataverseName, String libraryName,
             List<String> externalIdentifier, Boolean nullCall, Boolean deterministic, Map<String, String> resources,
-            List<List<DependencyFullyQualifiedName>> dependencies) {
+            List<List<DependencyFullyQualifiedName>> dependencies, Creator creator) {
         this.signature = signature;
         this.paramNames = paramNames;
         this.paramTypes = paramTypes;
@@ -72,6 +74,7 @@
         this.dependencies = dependencies == null
                 ? Arrays.asList(Collections.emptyList(), Collections.emptyList(), Collections.emptyList())
                 : dependencies;
+        this.creator = creator;
     }
 
     public FunctionSignature getSignature() {
@@ -161,6 +164,10 @@
         return dependencies;
     }
 
+    public Creator getCreator() {
+        return creator;
+    }
+
     @Override
     public Function addToCache(MetadataCache cache) {
         return cache.addFunctionIfNotExists(this);
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entitytupletranslators/FunctionTupleTranslator.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entitytupletranslators/FunctionTupleTranslator.java
index 8191212..2741d12 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entitytupletranslators/FunctionTupleTranslator.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/entitytupletranslators/FunctionTupleTranslator.java
@@ -61,6 +61,7 @@
 import org.apache.asterix.metadata.bootstrap.FunctionEntity;
 import org.apache.asterix.metadata.bootstrap.MetadataRecordTypes;
 import org.apache.asterix.metadata.entities.Function;
+import org.apache.asterix.metadata.utils.Creator;
 import org.apache.asterix.om.base.ABoolean;
 import org.apache.asterix.om.base.ANull;
 import org.apache.asterix.om.base.AOrderedList;
@@ -203,10 +204,11 @@
         }
 
         FunctionSignature signature = new FunctionSignature(databaseName, dataverseName, functionName, arity);
+        Creator creator = Creator.createOrDefault(functionRecord);
 
         return new Function(signature, paramNames, paramTypes, returnType, definition, functionKind, language,
                 libraryDatabaseName, libraryDataverseName, libraryName, externalIdentifier, nullCall, deterministic,
-                resources, dependencies);
+                resources, dependencies, creator);
     }
 
     private List<TypeSignature> getParamTypes(ARecord functionRecord, String functionDatabaseName,
@@ -432,6 +434,7 @@
         writeLibrary(function);
         writeNullCall(function);
         writeDeterministic(function);
+        writeFunctionCreator(function);
     }
 
     protected void writeResources(Function function) throws HyracksDataException {
@@ -688,4 +691,35 @@
                 throw new AsterixException(ErrorCode.METADATA_ERROR, language);
         }
     }
+
+    private void writeFunctionCreator(Function function) throws HyracksDataException {
+        if (functionEntity.databaseNameIndex() >= 0) {
+            Creator creatorInfo = function.getCreator();
+            RecordBuilder creatorObject = new RecordBuilder();
+            creatorObject.reset(DefaultOpenFieldType.NESTED_OPEN_RECORD_TYPE);
+
+            fieldName.reset();
+            aString.setValue(MetadataRecordTypes.FIELD_NAME_CREATOR_NAME);
+            stringSerde.serialize(aString, fieldName.getDataOutput());
+            fieldValue.reset();
+            aString.setValue(creatorInfo.getName());
+            stringSerde.serialize(aString, fieldValue.getDataOutput());
+            creatorObject.addField(fieldName, fieldValue);
+
+            fieldName.reset();
+            aString.setValue(MetadataRecordTypes.FIELD_NAME_CREATOR_UUID);
+            stringSerde.serialize(aString, fieldName.getDataOutput());
+            fieldValue.reset();
+            aString.setValue(creatorInfo.getUuid());
+            stringSerde.serialize(aString, fieldValue.getDataOutput());
+            creatorObject.addField(fieldName, fieldValue);
+
+            fieldName.reset();
+            aString.setValue(MetadataRecordTypes.CREATOR_ARECORD_FIELD_NAME);
+            stringSerde.serialize(aString, fieldName.getDataOutput());
+            fieldValue.reset();
+            creatorObject.write(fieldValue.getDataOutput(), true);
+            recordBuilder.addField(fieldName, fieldValue);
+        }
+    }
 }