Open vcf_header and data arrays in parallel (#696)

Co-authored-by: Seth Shelnutt <[email protected]>

Author: gspowley

libtiledbvcf/src/dataset/tiledbvcfdataset.cc

@@ -512,8 +512,17 @@ void TileDBVCFDataset::open(
   if (prefetch_data_array_fragment_info)
     preload_data_array_fragment_info();
 
-  data_array_ = open_data_array(TILEDB_READ);
-  vcf_header_array_ = open_vcf_array(TILEDB_READ);
+  // Open the data and vcf_header arrays in parallel
+  auto data_array_async = std::async(std::launch::async, [this]() {
+    data_array_ = open_data_array(TILEDB_READ);
+  });
+  auto vcf_header_array_async = std::async(std::launch::async, [this]() {
+    vcf_header_array_ = open_vcf_array(TILEDB_READ);
+  });
+
+  // Block until the arrays are open, log and rethrow any exceptions
+  TRY_CATCH_THROW(vcf_header_array_async.get());
+  TRY_CATCH_THROW(data_array_async.get());
   read_metadata();
 
   // We support V2, V3 and V4 (current) formats.

libtiledbvcf/src/enums/attr_datatype.h

@@ -30,6 +30,7 @@
 #ifndef TILEDB_VCF_ATTR_DATATYPE_H
 #define TILEDB_VCF_ATTR_DATATYPE_H
 
+#include <cstdint>
 #include <stdexcept>
 #include <string>