[BugFix] TableFunction not use low cardinality optimization (#62466)

Signed-off-by: satanson <ranpanf@gmail.com>
(cherry picked from commit 1ad0f4683e)
Signed-off-by: satanson <ranpanf@gmail.com>

fe/fe-core/src/main/java/com/starrocks/sql/optimizer/rule/tree/lowcardinality/DecodeCollector.java

@@ -116,6 +116,8 @@ public class DecodeCollector extends OptExpressionVisitor<DecodeInfo, DecodeInfo
 
     private final Map<Integer, List<CallOperator>> stringAggregateExpressions = Maps.newHashMap();
 
+    private final Map<Integer, Integer> tableFunctionDependencies = Maps.newHashMap();
+
     private final Map<Integer, ScalarOperator> stringRefToDefineExprMap = Maps.newHashMap();
 
     // string column use counter, 0 meanings decoded immediately after it was generated.
@@ -180,6 +182,10 @@ public class DecodeCollector extends OptExpressionVisitor<DecodeInfo, DecodeInfo
                 }
             }
         });
+
+        this.tableFunctionDependencies.forEach((k, v) -> {
+            dependencyStringIds.computeIfAbsent(v, x -> Sets.newHashSet()).add(k);
+        });
         // build relation groups. The same closure is built into the same group
         // eg:
         // 1 -> (2, 3)
@@ -523,6 +529,7 @@ public class DecodeCollector extends OptExpressionVisitor<DecodeInfo, DecodeInfo
                 stringRefToDefineExprMap.put(unnestOutput.getId(), unnestInput);
                 expressionStringRefCounter.put(unnestOutput.getId(), 1);
                 info.outputStringColumns.union(unnestOutput);
+                tableFunctionDependencies.put(unnestInput.getId(), unnestOutput.getId());
             }
         }
         return info;

fe/fe-core/src/test/java/com/starrocks/sql/plan/ReplayFromDumpTest.java

@@ -1056,4 +1056,25 @@ public class ReplayFromDumpTest extends ReplayFromDumpTestBase {
         }
     }
 
+    @Test
+    public void testUnnestLowCardinalityOptimization() throws Exception {
+        try {
+            FeConstants.USE_MOCK_DICT_MANAGER = true;
+            String dumpString = getDumpInfoFromFile("query_dump/unnest_low_cardinality_optimization");
+            QueryDumpInfo queryDumpInfo = getDumpInfoFromJson(dumpString);
+            Pair<QueryDumpInfo, String> replayPair = getPlanFragment(dumpString, queryDumpInfo.getSessionVariable(),
+                    TExplainLevel.NORMAL);
+            String plan = replayPair.second;
+            Assert.assertTrue(plan, plan.contains("  30:Project\n" +
+                    "  |  <slot 113> : 113: mock_field_111\n" +
+                    "  |  <slot 278> : lower(142: jl_str)\n" +
+                    "  |  \n" +
+                    "  29:TableValueFunction\n" +
+                    "  |  tableFunctionName: unnest\n" +
+                    "  |  columns: [unnest]\n" +
+                    "  |  returnTypes: [VARCHAR(65533)]"));
+        } finally {
+            FeConstants.USE_MOCK_DICT_MANAGER = false;
+        }
+    }
 }