Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18142#discussion_r119167774 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala --- @@ -1152,27 +1151,27 @@ class SessionCatalog( // Note: the implementation of this function is a little bit convoluted. // We probably shouldn't use a single FunctionRegistry to register all three kinds of functions // (built-in, temp, and external). - if (name.database.isEmpty && functionRegistry.functionExists(name.funcName)) { + if (name.database.isEmpty && functionRegistry.functionExists(name)) { // This function has been already loaded into the function registry. - return functionRegistry.lookupFunction(name.funcName, children) + return functionRegistry.lookupFunction(name, children) } // If the name itself is not qualified, add the current database to it. - val database = name.database.orElse(Some(currentDb)).map(formatDatabaseName) - val qualifiedName = name.copy(database = database) + val database = formatDatabaseName(name.database.getOrElse(getCurrentDatabase)) + val qualifiedName = name.copy(database = Some(database)) - if (functionRegistry.functionExists(qualifiedName.unquotedString)) { + if (functionRegistry.functionExists(qualifiedName)) { // This function has been already loaded into the function registry. // Unlike the above block, we find this function by using the qualified name. - return functionRegistry.lookupFunction(qualifiedName.unquotedString, children) + return functionRegistry.lookupFunction(qualifiedName, children) } // The function has not been loaded to the function registry, which means // that the function is a permanent function (if it actually has been registered // in the metastore). We need to first put the function in the FunctionRegistry. // TODO: why not just check whether the function exists first? val catalogFunction = try { - externalCatalog.getFunction(currentDb, name.funcName) --- End diff -- Submitted a separate PR #18146 for easily backporting to the previous branch.
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