SERVER-19510 Move text query parsing to TextMatchExpression::init()

- Introduces FTSQuery, which is now the base class for FTSQueryImpl.
- Introduces a derived class FTSQueryNoop (which
  TextNoOpMatchExpression now wraps).  libfts_query_noop is now linked
  into db/matcher/expressions.
- TextMatchExpression now parses the text query (which acquires a
  collection lock as part of the parsing process), and TextNode now
  stores a parsed version of the query.  The FTSQuery::parse() call in
  buildStages() is removed.

Behavior change: $text against a non-existent collection now returns
an error, instead of an empty result set.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mongo/db/exec/plan_stats.h b/src/mongo/db/exec/plan_stats.h
index 211b975b9dc..14e07391920 100644
--- a/src/mongo/db/exec/plan_stats.h
+++ b/src/mongo/db/exec/plan_stats.h
@@ -601,7 +601,7 @@ struct TextStats : public SpecificStats {
 
     std::string indexName;
 
-    // Human-readable form of the FTSQueryImpl associated with the text stage.
+    // Human-readable form of the FTSQuery associated with the text stage.
     BSONObj parsedTextQuery;
 
     // Index keys that precede the "text" index key.