From 148563b7e6277d9f48dc77a2a34772fa108d771d Mon Sep 17 00:00:00 2001
From: Kevin Gorham <anothergmale@gmail.com>
Date: Thu, 21 Feb 2019 10:52:13 -0500
Subject: [PATCH] modify scan operation to start from sapling activation.

Rather than starting from zero because we do not need non-sapling blocks, prior to sapling's activation.
---
 src/main/rust/sql.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main/rust/sql.rs b/src/main/rust/sql.rs
index cfac0864..c0935b3d 100644
--- a/src/main/rust/sql.rs
+++ b/src/main/rust/sql.rs
@@ -30,6 +30,7 @@ use zip32::{ExtendedFullViewingKey, ExtendedSpendingKey};
 // TODO: Expose this in zcash_client_backend
 const DEFAULT_FEE: i64 = 10000;
 const ANCHOR_OFFSET: u32 = 10;
+const SAPLING_ACTIVATION_HEIGHT: i32 = 280_000;
 
 fn address_from_extfvk(extfvk: &ExtendedFullViewingKey) -> String {
     let addr = extfvk.default_address().unwrap().1;
@@ -309,14 +310,14 @@ pub fn scan_cached_blocks<P: AsRef<Path>, Q: AsRef<Path>>(
     let data = Connection::open(db_data)?;
 
     // Recall where we synced up to previously.
-    // If we have never synced, use 0 to select all cached CompactBlocks.
+    // If we have never synced, use sapling activation height to select all cached CompactBlocks.
     let mut last_height =
         data.query_row(
             "SELECT MAX(height) FROM blocks",
             NO_PARAMS,
             |row| match row.get_checked(0) {
                 Ok(h) => h,
-                Err(_) => 0,
+                Err(_) => SAPLING_ACTIVATION_HEIGHT - 1,
             },
         )?;