Fix clang error in PartitionedFilterBlockBuilder

Summary: Closes https://github.com/facebook/rocksdb/pull/2536

Differential Revision: D5371271

Pulled By: maysamyabandeh

fbshipit-source-id: f1355ac658a79c9982a24986f0925c9e24fc39d5

table/block_based_table_builder.cc

@@ -81,9 +81,9 @@ FilterBlockBuilder* CreateFilterBlockBuilder(
       // as partition size.
       assert(table_opt.block_size_deviation <= 100);
       auto partition_size =
-          (const uint32_t)(table_opt.metadata_block_size *
-                           (100 - table_opt.block_size_deviation));
-      partition_size = std::max(partition_size, (const uint32_t)1);
+          static_cast<const uint32_t>(table_opt.metadata_block_size *
+                                      (100 - table_opt.block_size_deviation));
+      partition_size = std::max(partition_size, static_cast<const uint32_t>(1));
       return new PartitionedFilterBlockBuilder(
           opt.prefix_extractor, table_opt.whole_key_filtering,
           filter_bits_builder, table_opt.index_block_restart_interval,

table/partitioned_filter_block_test.cc

@@ -89,12 +89,10 @@ class PartitionedFilterBlockTest : public testing::Test {
 
   PartitionedFilterBlockBuilder* NewBuilder(
       PartitionedIndexBuilder* const p_index_builder) {
-    uint32_t partition_size =
-        table_options_.metadata_block_size >
-                (uint64_t)table_options_.block_size_deviation
-            ? table_options_.metadata_block_size -
-                  table_options_.block_size_deviation
-            : 1;
+    assert(table_opt.block_size_deviation <= 100);
+    auto partition_size = static_cast<const uint32_t>(
+        table_opt.metadata_block_size * (100 - table_opt.block_size_deviation));
+    partition_size = std::max(partition_size, static_cast<const uint32_t>(1));
     return new PartitionedFilterBlockBuilder(
         nullptr, table_options_.whole_key_filtering,
         table_options_.filter_policy->GetFilterBitsBuilder(),