Add patches to make passing down ClientContext optional

Author: carlopi

patches/duckdb/arrow_appender_opt_client_context.patch

@@ -0,0 +1,15 @@
+diff --git a/src/common/arrow/arrow_appender.cpp b/src/common/arrow/arrow_appender.cpp
+index 83f190b570..60c4b36268 100644
+--- a/src/common/arrow/arrow_appender.cpp
++++ b/src/common/arrow/arrow_appender.cpp
+@@ -40,8 +40,10 @@ void ArrowAppender::Append(DataChunk &input, const idx_t from, const idx_t to, c
+ 	for (idx_t i = 0; i < input.ColumnCount(); i++) {
+ 		if (root_data[i]->extension_data && root_data[i]->extension_data->duckdb_to_arrow) {
+ 			Vector input_data(root_data[i]->extension_data->GetInternalType());
++			if (options.client_context) {
+ 			root_data[i]->extension_data->duckdb_to_arrow(*options.client_context, input.data[i], input_data,
+ 			                                              input_size);
++			}
+ 			root_data[i]->append_vector(*root_data[i], input_data, from, to, input_size);
+ 		} else {
+ 			root_data[i]->append_vector(*root_data[i], input.data[i], from, to, input_size);

patches/duckdb/arrow_converter_opt_client_context.patch

@@ -0,0 +1,52 @@
+diff --git a/src/common/arrow/arrow_converter.cpp b/src/common/arrow/arrow_converter.cpp
+index a693034a92..a7d4b78889 100644
+--- a/src/common/arrow/arrow_converter.cpp
++++ b/src/common/arrow/arrow_converter.cpp
+@@ -59,10 +59,10 @@ void InitializeChild(ArrowSchema &child, DuckDBArrowSchemaHolder &root_holder, c
+ }
+ 
+ void SetArrowFormat(DuckDBArrowSchemaHolder &root_holder, ArrowSchema &child, const LogicalType &type,
+-                    ClientProperties &options, ClientContext &context);
++                    ClientProperties &options, optional_ptr<ClientContext> context);
+ 
+ void SetArrowMapFormat(DuckDBArrowSchemaHolder &root_holder, ArrowSchema &child, const LogicalType &type,
+-                       ClientProperties &options, ClientContext &context) {
++                       ClientProperties &options, optional_ptr<ClientContext> context) {
+ 	child.format = "+m";
+ 	//! Map has one child which is a struct
+ 	child.n_children = 1;
+@@ -77,18 +77,21 @@ void SetArrowMapFormat(DuckDBArrowSchemaHolder &root_holder, ArrowSchema &child,
+ }
+ 
+ bool SetArrowExtension(DuckDBArrowSchemaHolder &root_holder, ArrowSchema &child, const LogicalType &type,
+-                       ClientContext &context) {
+-	auto &config = DBConfig::GetConfig(context);
++                       optional_ptr<ClientContext> context) {
++	if (!context) {
++		return false;
++	}
++	auto &config = DBConfig::GetConfig(*context);
+ 	if (config.HasArrowExtension(type.id())) {
+ 		auto arrow_extension = config.GetArrowExtension(type.id());
+-		arrow_extension.PopulateArrowSchema(root_holder, child, type, context, arrow_extension);
++		arrow_extension.PopulateArrowSchema(root_holder, child, type, *context, arrow_extension);
+ 		return true;
+ 	}
+ 	return false;
+ }
+ 
+ void SetArrowFormat(DuckDBArrowSchemaHolder &root_holder, ArrowSchema &child, const LogicalType &type,
+-                    ClientProperties &options, ClientContext &context) {
++                    ClientProperties &options, optional_ptr<ClientContext> context) {
+ 	if (type.HasAlias()) {
+ 		// If it is a json type, we only export it as json if arrow_lossless_conversion = True
+ 		if (!(type.IsJSONType() && !options.arrow_lossless_conversion)) {
+@@ -402,7 +405,7 @@ void ArrowConverter::ToArrowSchema(ArrowSchema *out_schema, const vector<Logical
+ 		root_holder->owned_column_names.push_back(AddName(names[col_idx]));
+ 		auto &child = root_holder->children[col_idx];
+ 		InitializeChild(child, *root_holder, names[col_idx]);
+-		SetArrowFormat(*root_holder, child, types[col_idx], options, *options.client_context);
++		SetArrowFormat(*root_holder, child, types[col_idx], options, options.client_context);
+ 	}
+ 
+ 	// Release ownership to caller