Revert prior optimization commit due to troubleshooting failure

construct-edgelist.R

@@ -9,6 +9,10 @@ library(DBI)
 data.dir <- ""
 # Input data directory here, with trailing "/"
 
+source("https://gist.githubusercontent.com/jeffwong/5925000/raw/bf02ed0dd2963169a91664be02fb18e45c4d1e20/sqlitewritetable.R")
+# From https://gist.github.com/jeffwong/5925000
+# Modifies RSQLite's sqliteWriteTable function so as to reject duplicates
+
 con <- DBI::dbConnect(RSQLite::SQLite(), paste0(data.dir, "tx-graph-node-indices.db"))
 
 DBI::dbExecute(con, "PRAGMA max_page_count = 4294967292;")
@@ -21,7 +25,8 @@ DBI::dbExecute(con, "PRAGMA max_page_count = 4294967292;")
 
 DBI::dbExecute(con, "CREATE TABLE nodes (
 node TEXT,
-node_index INTEGER PRIMARY KEY
+node_index INTEGER PRIMARY KEY AUTOINCREMENT,
+unique(node)
 )")
 
 
@@ -63,31 +68,15 @@ for (file.iter in tx.graph.files) {
 
   new.nodes <- unique(c(tx.graph.chunk$origin, tx.graph.chunk$destination))
 
-  nodes.to.insert <- data.frame(node = new.nodes, stringsAsFactors = FALSE)
-
-  DBI::dbWriteTable(con, "nodes", 
-    nodes.to.insert, append = TRUE)
+  nodes.to.insert <- data.frame(node = new.nodes, node_index = NA, stringsAsFactors = FALSE)
 
+  mysqliteWriteTable(con, "nodes", 
+    nodes.to.insert, append = TRUE, row.names = FALSE, ignore = TRUE)
 
   cat(nrow(nodes.to.insert), "Nodes written\n")
 
-
-
 }
 
-base::date()
-DBI::dbExecute(con, "DELETE FROM nodes
-  WHERE rowid NOT IN (
-    SELECT MIN(rowid) 
-    FROM nodes 
-    GROUP BY node
-  )")
-base::date()
-# 1 hour
-
-# Suggested by https://stackoverflow.com/questions/25884095/how-can-i-delete-duplicates-in-sqlite
-# Must do this at the end to make sure did not leave any out
-# from the tail end of the last 1000 iters
 
 DBI::dbWriteTable(con, "edgelist_intermediate_1", 
   data.frame(origin = character(0), destination = character(0),