Merge pull request #41 from chdb-io/40-segfault-on-handled-exceptions

Fix empty buffer or memoryview handling

chdb/__init__.py

@@ -35,7 +35,8 @@ def to_arrowTable(res):
         print(f'ImportError: {e}')
         print('Please install pyarrow and pandas via "pip install pyarrow pandas"')
         raise ImportError('Failed to import pyarrow or pandas') from None
-
+    if len(res.get_memview()) == 0:
+        return pa.Table.from_batches([], schema=pa.schema([]))
     return pa.RecordBatchFileReader(res.get_memview()).read_all()
 
 

programs/local/LocalServer.cpp

@@ -61,6 +61,7 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int BAD_ARGUMENTS;
+    extern const int UNKNOWN_FORMAT;
     extern const int CANNOT_LOAD_CONFIG;
     extern const int FILE_ALREADY_EXISTS;
 }
@@ -557,6 +558,11 @@ void LocalServer::processConfig()
         global_context->setMacros(std::make_unique<Macros>(config(), "macros", log));
 
     format = config().getString("output-format", config().getString("format", is_interactive ? "PrettyCompact" : "TSV"));
+
+    /// Check format is supported before the engine runs too far
+    if (!FormatFactory::instance().isOutputFormat(format))
+        throw Exception(ErrorCodes::UNKNOWN_FORMAT, "Unknown output format {}", format);
+
     insert_format = "Values";
 
     /// Setting value from cmd arg overrides one from config