Move files out of vtab to core module (#359)

* Enforce call_width in rustfmt.toml

* Move core vector, logical_types, chunk into a seperate module

Author: Swoorup

.rustfmt.toml

@@ -1,2 +1,7 @@
 max_width = 120
-imports_granularity = "Crate"
+imports_granularity = "Crate"
+reorder_imports = true
+fn_call_width = 72
+# indent_style = "Block"
+# tab_spaces = 2
+# group_imports="StdExternalCrate"

crates/duckdb/examples/hello-ext/main.rs

@@ -3,7 +3,8 @@ extern crate duckdb_loadable_macros;
 extern crate libduckdb_sys;
 
 use duckdb::{
-    vtab::{BindInfo, DataChunk, Free, FunctionInfo, InitInfo, Inserter, LogicalType, LogicalTypeId, VTab},
+    core::{DataChunk, Inserter, LogicalType, LogicalTypeId},
+    vtab::{BindInfo, Free, FunctionInfo, InitInfo, VTab},
     Connection, Result,
 };
 use duckdb_loadable_macros::duckdb_entrypoint;

crates/duckdb/src/appender/arrow.rs

@@ -1,7 +1,8 @@
 use super::{ffi, Appender, Result};
 use crate::{
+    core::{DataChunk, LogicalType},
     error::result_from_duckdb_appender,
-    vtab::{record_batch_to_duckdb_data_chunk, to_duckdb_logical_type, DataChunk, LogicalType},
+    vtab::{record_batch_to_duckdb_data_chunk, to_duckdb_logical_type},
     Error,
 };
 use arrow::record_batch::RecordBatch;

crates/duckdb/src/vtab/data_chunk.rs renamed to crates/duckdb/src/core/data_chunk.rs

@@ -293,30 +293,30 @@ impl LogicalType {
 
 #[cfg(test)]
 mod test {
-    use super::{LogicalType, LogicalTypeId};
+    use crate::core::{LogicalType, LogicalTypeId};
 
     #[test]
     fn test_struct() {
-        let fields = &[("hello", LogicalType::new(crate::vtab::LogicalTypeId::Boolean))];
+        let fields = &[("hello", LogicalType::new(crate::core::LogicalTypeId::Boolean))];
         let typ = LogicalType::struct_type(fields);
 
         assert_eq!(typ.num_children(), 1);
         assert_eq!(typ.child_name(0), "hello");
-        assert_eq!(typ.child(0).id(), crate::vtab::LogicalTypeId::Boolean);
+        assert_eq!(typ.child(0).id(), crate::core::LogicalTypeId::Boolean);
     }
 
     #[test]
     fn test_decimal() {
         let typ = LogicalType::decimal(10, 2);
 
-        assert_eq!(typ.id(), crate::vtab::LogicalTypeId::Decimal);
+        assert_eq!(typ.id(), crate::core::LogicalTypeId::Decimal);
         assert_eq!(typ.decimal_width(), 10);
         assert_eq!(typ.decimal_scale(), 2);
     }
 
     #[test]
     fn test_decimal_methods() {
-        let typ = LogicalType::new(crate::vtab::LogicalTypeId::Varchar);
+        let typ = LogicalType::new(crate::core::LogicalTypeId::Varchar);
 
         assert_eq!(typ.decimal_width(), 0);
         assert_eq!(typ.decimal_scale(), 0);

crates/duckdb/src/vtab/logical_type.rs renamed to crates/duckdb/src/core/logical_type.rs

@@ -0,0 +1,7 @@
+mod data_chunk;
+mod logical_type;
+mod vector;
+
+pub use data_chunk::DataChunk;
+pub use logical_type::{LogicalType, LogicalTypeId};
+pub use vector::*;

crates/duckdb/src/core/mod.rs

@@ -206,6 +206,7 @@ impl ArrayVector {
         LogicalType::from(unsafe { duckdb_vector_get_column_type(self.ptr) })
     }
 
+    /// Returns the size of the array type.
     pub fn get_array_size(&self) -> u64 {
         let ty = self.logical_type();
         unsafe { duckdb_array_type_array_size(ty.ptr) as u64 }

crates/duckdb/src/vtab/vector.rs renamed to crates/duckdb/src/core/vector.rs

@@ -93,6 +93,9 @@ pub use arrow;
 #[cfg(feature = "polars")]
 pub use polars::{self, export::arrow as arrow2};
 
+/// The core module contains the main functionality of the DuckDB crate.
+pub mod core;
+
 #[macro_use]
 mod error;
 mod appender;

crates/duckdb/src/lib.rs

@@ -1,10 +1,7 @@
-use super::{
-    vector::{ArrayVector, FlatVector, ListVector, Vector},
-    BindInfo, DataChunk, Free, FunctionInfo, InitInfo, LogicalType, LogicalTypeId, StructVector, VTab,
-};
+use super::{BindInfo, DataChunk, Free, FunctionInfo, InitInfo, LogicalType, LogicalTypeId, VTab};
 use std::ptr::null_mut;
 
-use crate::vtab::vector::Inserter;
+use crate::core::{ArrayVector, FlatVector, Inserter, ListVector, StructVector, Vector};
 use arrow::array::{
     as_boolean_array, as_generic_binary_array, as_large_list_array, as_list_array, as_primitive_array, as_string_array,
     as_struct_array, Array, ArrayData, AsArray, BinaryArray, BooleanArray, Decimal128Array, FixedSizeListArray,

crates/duckdb/src/vtab/arrow.rs

@@ -1,5 +1,5 @@
 use super::{BindInfo, DataChunk, Free, FunctionInfo, InitInfo, LogicalType, LogicalTypeId, VTab};
-use crate::vtab::vector::Inserter;
+use crate::core::Inserter;
 use calamine::{open_workbook_auto, DataType, Range, Reader};
 
 #[repr(C)]