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The following commit(s) were added to refs/heads/master by this push:
     new 756b9c26540 [bugfix](external)Modify the default value of 
`pushdowncount` (#37754)
756b9c26540 is described below

commit 756b9c26540375847fdb5b79baffd201a247caee
Author: wuwenchi <wuwenchi...@hotmail.com>
AuthorDate: Tue Jul 16 18:55:27 2024 +0800

    [bugfix](external)Modify the default value of `pushdowncount` (#37754)
    
    ## Proposed changes
    
    1. Do not use `0`: If the number of entries in the table is 0, it is
    unclear whether optimization has been performed.
    2. Do not use `null` or `-`: This makes it easier for the program to
    parse the `explain` data.
---
 .../src/main/java/org/apache/doris/datasource/FileScanNode.java      | 5 ++++-
 .../external_table_p0/iceberg/test_iceberg_optimize_count.groovy     | 1 -
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git 
a/fe/fe-core/src/main/java/org/apache/doris/datasource/FileScanNode.java 
b/fe/fe-core/src/main/java/org/apache/doris/datasource/FileScanNode.java
index 3c59c3d34cc..1213c1c03f2 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/FileScanNode.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/FileScanNode.java
@@ -98,7 +98,10 @@ public abstract class FileScanNode extends ExternalScanNode {
     }
 
     public long getPushDownCount() {
-        return 0;
+        // 1. Do not use `0`: If the number of entries in the table is 0,
+        //                    it is unclear whether optimization has been 
performed.
+        // 2. Do not use `null` or `-`: This makes it easier for the program 
to parse the `explain` data.
+        return -1;
     }
 
     @Override
diff --git 
a/regression-test/suites/external_table_p0/iceberg/test_iceberg_optimize_count.groovy
 
b/regression-test/suites/external_table_p0/iceberg/test_iceberg_optimize_count.groovy
index e55d0fefa8d..6c7789a6ca1 100644
--- 
a/regression-test/suites/external_table_p0/iceberg/test_iceberg_optimize_count.groovy
+++ 
b/regression-test/suites/external_table_p0/iceberg/test_iceberg_optimize_count.groovy
@@ -40,7 +40,6 @@ suite("test_iceberg_optimize_count", 
"p0,external,doris,external_docker,external
             );"""
 
         sql """ switch ${catalog_name} """
-        sql """ create database if not exists ${catalog_name} """
         sql """ use format_v2 """
 
         sqlstr1 = """ select count(*) from sample_cow_orc; """


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