[sql] Import reference version of SQLite 3.17..

third_party/sqlite/sqlite-src-3170000/ext/fts5/tool/showfts5.tcl

Index: third_party/sqlite/sqlite-src-3170000/ext/fts5/tool/showfts5.tcl
diff --git a/third_party/sqlite/sqlite-src-3170000/ext/fts5/tool/showfts5.tcl b/third_party/sqlite/sqlite-src-3170000/ext/fts5/tool/showfts5.tcl
new file mode 100644
index 0000000000000000000000000000000000000000..75ac0f1c8f809dca172b1130b3a0452cc2c4d127
--- /dev/null
+++ b/third_party/sqlite/sqlite-src-3170000/ext/fts5/tool/showfts5.tcl
@@ -0,0 +1,97 @@
+
+
+
+#-------------------------------------------------------------------------
+# Process command line arguments.
+#
+proc usage {} {
+  puts stderr "usage: $::argv0 ?OPTIONS? database table"
+  puts stderr ""
+  puts stderr "  -nterm                (count number of terms in each segment)"
+  puts stderr "  -segments             (output segment contents)"
+  puts stderr ""
+  exit 1
+}
+
+set O(nterm) 0
+set O(segments) 0
+
+if {[llength $argv]<2} usage
+foreach a [lrange $argv 0 end-2] {
+  switch -- $a {
+    -nterm {
+      set O(nterm) 1
+    }
+
+    -segments {
+      set O(segments) 1
+    }
+
+    default {
+      usage
+    }
+  }
+}
+
+set database [lindex $argv end-1]
+set tbl [lindex $argv end]
+
+
+#-------------------------------------------------------------------------
+# Count the number of terms in each segment of fts5 table $tbl. Store the
+# counts in the array variable in the parent context named by parameter
+# $arrayname, indexed by segment-id. Example:
+#
+#   count_terms fts_tbl A
+#   foreach {k v} [array get A] { puts "segid=$k nTerm=$v" }
+#
+proc count_terms {tbl arrayname} {
+  upvar A $arrayname
+  array unset A
+  db eval "SELECT fts5_decode(rowid, block) AS d FROM ${tbl}_data" {
+    set desc [lindex $d 0]
+    if {[regexp {^segid=([0-9]*)} $desc -> id]} {
+      foreach i [lrange $d 1 end] {
+        if {[string match {term=*} $i]} { incr A($id) }
+      }
+    }
+  }
+}
+
+
+#-------------------------------------------------------------------------
+# Start of main program.
+#
+sqlite3 db $database
+catch { load_static_extension db fts5 }
+
+if {$O(nterm)} { count_terms $tbl A }
+
+db eval "SELECT fts5_decode(rowid, block) AS d FROM ${tbl}_data WHERE id=10" {
+  foreach lvl [lrange $d 1 end] {
+    puts [lrange $lvl 0 2]
+
+    foreach seg [lrange $lvl 3 end] {
+      if {$::O(nterm)} {
+        regexp {^id=([0-9]*)} $seg -> id
+        set nTerm 0
+        catch { set nTerm $A($id) }
+        puts [format "        % -28s    nTerm=%d" $seg $nTerm]
+      } else {
+        puts [format "        % -28s" $seg]
+      }
+    }
+  }
+}
+
+if {$O(segments)} {
+  puts ""
+  db eval "SELECT fts5_decode(rowid, block) AS d FROM ${tbl}_data WHERE id>10" {
+    puts $d
+  }
+}
+
+
+
+
+