[fix][core] Adjust the precision and scale of the return type of avg function

guojn1 · guojn1 · commit 5aeba76299e4 · 2025-10-09T14:25:36.000+08:00
diff --git a/core/src/main/java/org/apache/calcite/rel/type/RelDataTypeSystemImpl.java b/core/src/main/java/org/apache/calcite/rel/type/RelDataTypeSystemImpl.java
@@ -243,7 +243,7 @@ && getDefaultPrecision(typeName) != -1) {
     if(argumentType.getSqlTypeName() == SqlTypeName.TINYINT ||
        argumentType.getSqlTypeName() == SqlTypeName.INTEGER ||
        argumentType.getSqlTypeName() == SqlTypeName.BIGINT) {
-      return typeFactory.createSqlType(SqlTypeName.DECIMAL);
+      return typeFactory.createSqlType(SqlTypeName.DECIMAL, 14, 4);
     }
     return argumentType;
   }

Original file line number	Diff line number	Diff line change
`@@ -243,7 +243,7 @@ && getDefaultPrecision(typeName) != -1) {`
`243`	`243`	`if(argumentType.getSqlTypeName() == SqlTypeName.TINYINT \|\|`
`244`	`244`	`argumentType.getSqlTypeName() == SqlTypeName.INTEGER \|\|`
`245`	`245`	`argumentType.getSqlTypeName() == SqlTypeName.BIGINT) {`
`246`		`- return typeFactory.createSqlType(SqlTypeName.DECIMAL);`
	`246`	`+ return typeFactory.createSqlType(SqlTypeName.DECIMAL, 14, 4);`
`247`	`247`	`}`
`248`	`248`	`return argumentType;`
`249`	`249`	`}`