Avoid bigint for metadata queries (#508)

* Avoid bigint for metadata queries

* Use f64 for > 4 billion row datasets

Author: kylebarron

README.md

@@ -24,12 +24,12 @@ npm install parquet-wasm
 
 ### Choice of bundles
 
-| Entry point                  | Description                                             | Documentation        |
-| ---------------------------- | ------------------------------------------------------- | -------------------- |
-| `parquet-wasm`               | ESM, to be used directly from the Web as an ES Module   | [Link][esm-docs]     |
-| `parquet-wasm/esm` (default) | ESM, to be used directly from the Web as an ES Module   | [Link][esm-docs]     |
-| `parquet-wasm/bundler`       | "Bundler" build, to be used in bundlers such as Webpack | [Link][bundler-docs] |
-| `parquet-wasm/node`          | Node build, to be used with `require` in NodeJS         | [Link][node-docs]    |
+| Entry point            | Description                                             | Documentation        |
+| ---------------------- | ------------------------------------------------------- | -------------------- |
+| `parquet-wasm`         | ESM, to be used directly from the Web as an ES Module   | [Link][esm-docs]     |
+| `parquet-wasm/esm`     | ESM, to be used directly from the Web as an ES Module   | [Link][esm-docs]     |
+| `parquet-wasm/bundler` | "Bundler" build, to be used in bundlers such as Webpack | [Link][bundler-docs] |
+| `parquet-wasm/node`    | Node build, to be used with `require` in NodeJS         | [Link][node-docs]    |
 
 [bundler-docs]: https://kylebarron.dev/parquet-wasm/modules/bundler_parquet_wasm.html
 [node-docs]: https://kylebarron.dev/parquet-wasm/modules/node_parquet_wasm.html

src/metadata.rs

@@ -71,8 +71,8 @@ impl FileMetaData {
 
     /// Returns number of rows in the file.
     #[wasm_bindgen(js_name = numRows)]
-    pub fn num_rows(&self) -> i64 {
-        self.0.num_rows()
+    pub fn num_rows(&self) -> f64 {
+        self.0.num_rows() as f64
     }
 
     /// String message for application that wrote this file.
@@ -147,20 +147,20 @@ impl RowGroupMetaData {
 
     /// Number of rows in this row group.
     #[wasm_bindgen(js_name = numRows)]
-    pub fn num_rows(&self) -> i64 {
-        self.0.num_rows()
+    pub fn num_rows(&self) -> f64 {
+        self.0.num_rows() as f64
     }
 
     /// Total byte size of all uncompressed column data in this row group.
     #[wasm_bindgen(js_name = totalByteSize)]
-    pub fn total_byte_size(&self) -> i64 {
-        self.0.total_byte_size()
+    pub fn total_byte_size(&self) -> f64 {
+        self.0.total_byte_size() as f64
     }
 
     /// Total size of all compressed column data in this row group.
     #[wasm_bindgen(js_name = compressedSize)]
-    pub fn compressed_size(&self) -> i64 {
-        self.0.compressed_size()
+    pub fn compressed_size(&self) -> f64 {
+        self.0.compressed_size() as f64
     }
 }
 
@@ -222,8 +222,8 @@ impl ColumnChunkMetaData {
 
     /// Total number of values in this column chunk.
     #[wasm_bindgen(js_name = numValues)]
-    pub fn num_values(&self) -> i64 {
-        self.0.num_values()
+    pub fn num_values(&self) -> f64 {
+        self.0.num_values() as f64
     }
 
     /// Compression for this column.
@@ -233,14 +233,14 @@ impl ColumnChunkMetaData {
 
     /// Returns the total compressed data size of this column chunk.
     #[wasm_bindgen(js_name = compressedSize)]
-    pub fn compressed_size(&self) -> i64 {
-        self.0.compressed_size()
+    pub fn compressed_size(&self) -> f64 {
+        self.0.compressed_size() as f64
     }
 
     /// Returns the total uncompressed data size of this column chunk.
     #[wasm_bindgen(js_name = uncompressedSize)]
-    pub fn uncompressed_size(&self) -> i64 {
-        self.0.uncompressed_size()
+    pub fn uncompressed_size(&self) -> f64 {
+        self.0.uncompressed_size() as f64
     }
 }