Merge pull request #2929 from poanetwork/vb-speedup-pending-block-ops-int-txs-to-fetch-query

Speedup pending block ops int txs to fetch query

CHANGELOG.md

@@ -4,6 +4,7 @@
 - [#2835](https://github.com/poanetwork/blockscout/pull/2835), [#2871](https://github.com/poanetwork/blockscout/pull/2871), [#2872](https://github.com/poanetwork/blockscout/pull/2872), [#2886](https://github.com/poanetwork/blockscout/pull/2886), [#2925](https://github.com/poanetwork/blockscout/pull/2925) - Add "block_hash" to logs, token_transfers and internal transactions and "pending blocks operations" approach
 
 ### Fixes
+- [#2928](https://github.com/poanetwork/blockscout/pull/2928) - Speedup pending block ops int txs to fetch query
 - [#2906](https://github.com/poanetwork/blockscout/pull/2906) - fix address sum cache
 - [#2902](https://github.com/poanetwork/blockscout/pull/2902) - Offset in blocks retrieval for average block time
 

apps/explorer/priv/repo/migrations/20191220113006_pending_block_operations_block_hash_partial_index.exs

@@ -0,0 +1,9 @@
+defmodule Explorer.Repo.Migrations.PendingBlockOperationsBlockHashPartialIndex do
+  use Ecto.Migration
+
+  def change do
+    execute(
+      "CREATE INDEX pending_block_operations_block_hash_index_partial ON pending_block_operations(block_hash) WHERE fetch_internal_transactions=true;"
+    )
+  end
+end