[fix](window) allow constant expression evaluation in LAG/LEAD offset parameter

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/window/Lag.java

@@ -93,7 +93,7 @@ public Lag withChildren(List<Expression> children) {
     }
 
     @Override
-    public void checkLegalityBeforeTypeCoercion() {
+    public void checkLegalityAfterRewrite() {
         if (children().size() == 1) {
             return;
         }

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/window/Lead.java

@@ -94,7 +94,7 @@ public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
     }
 
     @Override
-    public void checkLegalityBeforeTypeCoercion() {
+    public void checkLegalityAfterRewrite() {
         if (children().size() == 1) {
             return;
         }
@@ -107,7 +107,7 @@ public void checkLegalityBeforeTypeCoercion() {
                 }
             } else {
                 throw new AnalysisException(
-                    "The offset parameter of LAG must be a constant positive integer: " + this.toSql());
+                    "The offset parameter of LEAD must be a constant positive integer: " + this.toSql());
             }
         }
     }

regression-test/data/nereids_syntax_p0/lag_lead_signature.out

@@ -0,0 +1,25 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !sql1 --
+0
+0
+
+-- !sql2 --
+0
+44
+
+-- !sql3 --
+0
+0
+
+-- !sql4 --
+0
+0
+
+-- !sql5 --
+0
+28
+
+-- !sql6 --
+0
+0
+

regression-test/suites/nereids_syntax_p0/lag_lead_signature.groovy

@@ -20,16 +20,43 @@ suite("lag_lead_signature") {
     sql "SET enable_fallback_to_original_planner=false"
     sql """drop table if exists lag_lead_signature_t"""
     sql """ CREATE TABLE lag_lead_signature_t (
-            `k` VARCHAR(200) NULL
+            `k` VARCHAR(200) NULL,
+            `id` BIGINT NULL
             ) ENGINE=OLAP
             DUPLICATE KEY(`k`)
             DISTRIBUTED BY HASH(`k`) BUCKETS 3
             PROPERTIES (
             "replication_allocation" = "tag.location.default: 1"
             );"""
 
-    sql "insert into lag_lead_signature_t values ('44'), ('28');"
+    sql "insert into lag_lead_signature_t values ('44','10'), ('28','11');"
 
     sql "select lag(k, 1, 0) over(), lead(k, 1, 0) over() from lag_lead_signature_t;"
 
+    qt_sql1 "select lag(k, 1 + 1, 0) over(order by id) from lag_lead_signature_t order by 1;"
+    qt_sql2 "select lag(k, abs(1), 0) over(order by id) from lag_lead_signature_t order by 1;"
+    qt_sql3 "select lag(k, abs(1) + 1, 0) over(order by id) from lag_lead_signature_t order by 1;"
+    qt_sql4 "select lead(k, 1 + 1, 0) over(order by id) from lag_lead_signature_t order by 1;"
+    qt_sql5 "select lead(k, abs(1), 0) over(order by id) from lag_lead_signature_t order by 1;"
+    qt_sql6 "select lead(k, abs(1) + 1, 0) over(order by id) from lag_lead_signature_t order by 1;"
+
+    test {
+        sql "select lag(k, -100, 0) over() from lag_lead_signature_t;"
+        exception "be a constant positive integer"
+    }
+
+    test {
+        sql "select lead(k, -100, 0) over() from lag_lead_signature_t;"
+        exception "be a constant positive integer"
+    }
+
+    test {
+        sql "select lead(k, id, 0) over() from lag_lead_signature_t;"
+        exception "must be a constant value"
+    }
+
+    test {
+        sql "select lag(k, id, 0) over() from lag_lead_signature_t;"
+        exception "must be a constant value"
+    }
 }