[fix](scan) Default enable function(Like) pushdown apache#17154

function pushdown: apache#10355
NGram BloomFilter Index apply like pushdown: apache#11579

Enabled by default, make sure it stays active.

If NGram BloomFilter Index is not used, this like pushdown can be replaced by apache#15917, which can push down all expressions including like.

Author: xinyiZzz

be/src/olap/rowset/segment_v2/segment_iterator.cpp

@@ -24,6 +24,7 @@
 #include "common/consts.h"
 #include "common/status.h"
 #include "olap/column_predicate.h"
+#include "olap/like_column_predicate.h"
 #include "olap/olap_common.h"
 #include "olap/rowset/segment_v2/column_reader.h"
 #include "olap/rowset/segment_v2/segment.h"
@@ -568,6 +569,12 @@ bool SegmentIterator::_check_apply_by_inverted_index(ColumnPredicate* pred, bool
         return false;
     }
 
+    // Function filter no apply inverted index
+    if (dynamic_cast<LikeColumnPredicate<false>*>(pred) ||
+        dynamic_cast<LikeColumnPredicate<true>*>(pred)) {
+        return false;
+    }
+
     bool handle_by_fulltext = _column_has_fulltext_index(unique_id);
     if (handle_by_fulltext) {
         // when predicate in compound condition which except leafNode of andNode,

fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java

@@ -630,7 +630,7 @@ public class SessionVariable implements Serializable, Writable {
     public boolean enableSingleReplicaInsert = false;
 
     @VariableMgr.VarAttr(name = ENABLE_FUNCTION_PUSHDOWN)
-    public boolean enableFunctionPushdown;
+    public boolean enableFunctionPushdown = true;
 
     @VariableMgr.VarAttr(name = ENABLE_LOCAL_EXCHANGE, fuzzy = true)
     public boolean enableLocalExchange = true;