Short of full header indexing, wouldn't a better way to achieve this be to store only the "to" header as "XTO", the "cc" header "XCC", and the "bcc" header as "XBCC" and use Xapian's multi-prefix support to map the "to:" query prefix to "XTO", "XCC", and "XBCC"?  That way you're not storing twice as many copies of  every address.

On Wed, Dec 1, 2010 at 3:33 PM, Joel Borggrén-Franck <joel.borggren.franck@gmail.com> wrote:
From: Joel Borggrén-Franck <jbf@codehouse.se>

Add headers cc: bcc: and to: to index. Real header to: is searched as
"exactto:foo@bar.baz" and search term "to:" is kept as a union of cc:,
bcc: and to: for backward compatibility. Use search term "cc:" resp.
"bcc:" to search those headers respectively.
---
 lib/database.cc |   11 +++++++----
 lib/index.cc    |    9 +++++++++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/lib/database.cc b/lib/database.cc
index 7a00917..68910f3 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -88,9 +88,9 @@ typedef struct {
 *     MESSAGE_ID:     The unique ID of the mail mess (see "id" above)
 *
 * In addition, terms from the content of the message are added with
- * "from", "to", "attachment", and "subject" prefixes for use by the
- * user in searching. But the database doesn't really care itself
- * about any of these.
+ * "from", "to", "exactto", "cc", "bbc", "attachment" and "subject"
+ * prefixes for use by the user in searching. But the database doesn't
+ * really care itself about any of these.
 *
 * The data portion of a mail document is empty.
 *
@@ -204,7 +204,10 @@ static prefix_t PROBABILISTIC_PREFIX[]= {
    { "from",                  "XFROM" },
    { "to",                    "XTO" },
    { "attachment",            "XATTACHMENT" },
-    { "subject",               "XSUBJECT"}
+    { "subject",               "XSUBJECT"},
+    { "exactto",                "XEXACTTO"},
+    { "cc",                     "XCC"},
+    { "bcc",                    "XBCC"},
 };

 int
diff --git a/lib/index.cc b/lib/index.cc
index 00478f8..d59c255 100644
--- a/lib/index.cc
+++ b/lib/index.cc
@@ -455,6 +455,15 @@ _notmuch_message_index_file (notmuch_message_t *message,

    _index_address_list (message, "from", addresses);

+    addresses = g_mime_message_get_recipients (mime_message, GMIME_RECIPIENT_TYPE_TO);
+    _index_address_list (message, "exactto", addresses);
+
+    addresses = g_mime_message_get_recipients (mime_message, GMIME_RECIPIENT_TYPE_CC);
+    _index_address_list (message, "cc", addresses);
+
+    addresses = g_mime_message_get_recipients (mime_message, GMIME_RECIPIENT_TYPE_BCC);
+    _index_address_list (message, "bcc", addresses);
+
    addresses = g_mime_message_get_all_recipients (mime_message);
    _index_address_list (message, "to", addresses);
<font color="#888888">
--
1.7.3.2

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