[opt](inverted index) Controls whether the in_list can execute fast_execute. (#40141)

https://github.com/apache/doris/pull/40022

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

@@ -621,6 +621,8 @@ public class SessionVariable implements Serializable, Writable {
     public static final String ENABLE_MATCH_WITHOUT_INVERTED_INDEX = "enable_match_without_inverted_index";
     public static final String ENABLE_FALLBACK_ON_MISSING_INVERTED_INDEX = "enable_fallback_on_missing_inverted_index";
 
+    public static final String IN_LIST_VALUE_COUNT_THRESHOLD = "in_list_value_count_threshold";
+
     /**
      * If set false, user couldn't submit analyze SQL and FE won't allocate any related resources.
      */
@@ -2022,6 +2024,13 @@ public class SessionVariable implements Serializable, Writable {
     })
     public boolean enableFallbackOnMissingInvertedIndex = true;
 
+    @VariableMgr.VarAttr(name = IN_LIST_VALUE_COUNT_THRESHOLD, description = {
+        "in条件value数量大于这个threshold后将不会走fast_execute",
+        "When the number of values in the IN condition exceeds this threshold,"
+                + " fast_execute will not be used."
+    })
+    public int inListValueCountThreshold = 10;
+
     public void setEnableEsParallelScroll(boolean enableESParallelScroll) {
         this.enableESParallelScroll = enableESParallelScroll;
     }
@@ -3525,6 +3534,7 @@ public class SessionVariable implements Serializable, Writable {
         tResult.setEnableFallbackOnMissingInvertedIndex(enableFallbackOnMissingInvertedIndex);
 
         tResult.setKeepCarriageReturn(keepCarriageReturn);
+        tResult.setInListValueCountThreshold(inListValueCountThreshold);
         return tResult;
     }