[doris] 01/02: [fix](planner) Fix an issue where outputSmap's size could grow exponentially (#11378)

[yiguolei]

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yiguolei pushed a commit to branch dev-1.1.2
in repository https://gitbox.apache.org/repos/asf/doris.git

commit f63f45211f2b50947be378886361a7f97713bc1f
Author: Mingyu Chen <morningman....@gmail.com>
AuthorDate: Wed Aug 3 09:07:00 2022 +0800

    [fix](planner) Fix an issue where outputSmap's size  could grow 
exponentially (#11378)
    
    * [fix](planner) Fix an issue where outputSmap'size  could grow 
exponentially
---
 .../main/java/org/apache/doris/analysis/ExprSubstitutionMap.java   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git 
a/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java 
b/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
index 5065c6ebdf..35077b05f9 100644
--- 
a/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
+++ 
b/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
@@ -24,6 +24,9 @@ import java.util.Objects;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import com.google.common.base.Joiner;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
 
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
@@ -211,7 +214,9 @@ public final class ExprSubstitutionMap {
                 Expr fRhs = f.getRhs().get(j);
                 if (fRhs.contains(gLhs)) {
                     Expr newRhs = fRhs.trySubstitute(g, analyzer, false);
-                    result.put(f.getLhs().get(j), newRhs);
+                    if (!result.containsMappingFor(f.getLhs().get(j))) {
+                        result.put(f.getLhs().get(j), newRhs);
+                    }
                     findGMatch = true;
                 }
             }


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