[fix](function) avoid calculating sqrt of negative in agg function CO…

…RR (apache#39324)

Issue Number: close #xxx

before:
```sql
mysql [sqlfunctest]>SELECT CORR(data, 89.999999) FROM DOUBLEDATA_NOT_EMPTY_NULLABLE;
+---------------------------------------+
| corr(data, cast(89.999999 as DOUBLE)) |
+---------------------------------------+
|                                  NULL |
+---------------------------------------+
1 row in set (0.53 sec)
```
--- actually here's a silent nan by float exception. now sure in all
platform.

after:
```sql
mysql [sqlfunctest]>SELECT CORR(data, 89.999999) FROM DOUBLEDATA_NOT_EMPTY_NULLABLE;
+---------------------------------------+
| corr(data, cast(89.999999 as DOUBLE)) |
+---------------------------------------+
|                                     0 |
+---------------------------------------+
1 row in set (0.13 sec)
```
--- is stable

be/src/vec/aggregate_functions/aggregate_function_corr.cpp

@@ -68,7 +68,8 @@ struct CorrMoment {
     }
 
     T get() const {
-        if ((m0 * x2 - x1 * x1) * (m0 * y2 - y1 * y1) == 0) [[unlikely]] {
+        // avoid float error(silent nan) when x or y is constant
+        if (m0 * x2 <= x1 * x1 || m0 * y2 <= y1 * y1) [[unlikely]] {
             return 0;
         }
         return (m0 * xy - x1 * y1) / sqrt((m0 * x2 - x1 * x1) * (m0 * y2 - y1 * y1));

regression-test/data/nereids_function_p0/agg_function/test_corr.out

@@ -33,5 +33,22 @@
 0.0
 0.0
 0.0
+
+-- !sql_const1 --
+0.0
+
+-- !sql_const2 --
+0.0
+
+-- !sql_const3 --
+0.0
+
+-- !sql_const4 --
+0.0
+
+-- !sql_const5 --
+0.0
+
+-- !sql_const6 --
 0.0
 

regression-test/suites/nereids_function_p0/agg_function/test_corr.groovy

@@ -86,4 +86,11 @@ suite("test_corr") {
     qt_sql1 "select corr(non_nullable(x), non_nullable(y)) ans from test_corr group by id order by ans"
     qt_sql2 "select corr(x, non_nullable(y)) ans from test_corr group by id order by ans"
     qt_sql3 "select corr(non_nullable(x), y) ans from test_corr group by id order by ans"
+
+    qt_sql_const1 "select corr(x,1) from test_corr"
+    qt_sql_const2 "select corr(x,1e100) from test_corr"
+    qt_sql_const3 "select corr(x,1e-100) from test_corr"
+    qt_sql_const4 "select corr(1,y) from test_corr"
+    qt_sql_const5 "select corr(1e100,y) from test_corr"
+    qt_sql_const6 "select corr(1e-100,y) from test_corr"
 }