improve nit (#603)

Co-authored-by: Yingjian Wu <[email protected]>

Author: yingjianwu98

metacat-main/src/main/java/com/netflix/metacat/main/api/v1/ParentChildRelController.java

@@ -75,11 +75,11 @@ public Set<ChildInfoDto> getChildren(
     }
 
     /**
-     * Return the list of children for a given table.
+     * Return the list of parent for a given table.
      * @param catalogName catalogName
      * @param databaseName databaseName
      * @param tableName tableName
-     * @return list of childInfoDto
+     * @return list of parentInfoDto
      */
     @RequestMapping(method = RequestMethod.GET,
         path = "/parents/catalog/{catalog-name}/database/{database-name}/table/{table-name}")

metacat-metadata-mysql/src/main/java/com/netflix/metacat/metadata/mysql/MySqlParentChildRelMetaDataService.java

@@ -117,7 +117,7 @@ private void validateMaxAllow(final QualifiedName parentName,
             true
         );
 
-        // Then check if the parent have configured max allowed on the db config
+        // Then check if the parent has a configured max allowed setting on the db config
         if (maxAllow == null) {
             maxAllow = getMaxAllowedFromNestedMap(
                 parentName,
@@ -127,7 +127,7 @@ private void validateMaxAllow(final QualifiedName parentName,
             );
         }
 
-        // If not specified in maxAllowPerDBPerRelType,check the default max Allow based on relationType
+        // If not specified in maxAllowPerDBPerRelType,check the default maxAllow based on relationType
         if (maxAllow == null) {
             final Integer count = props.getDefaultMaxAllowPerRelType().get(type);
             if (count != null) {
@@ -140,7 +140,7 @@ private void validateMaxAllow(final QualifiedName parentName,
             maxAllow = props.getMaxAllow();
         }
 
-        // if maxAllow < 0, this means we can create as many child table under the parent
+        // if maxAllow < 0, this means we can create unlimited child tables under the parent
         if (maxAllow < 0) {
             return;
         }
@@ -164,15 +164,15 @@ private void validateCreate(final QualifiedName parentName,
         if (!childParents.isEmpty()) {
             throw new ParentChildRelServiceException("Cannot have a child table having more than one parent "
                 + "- Child Table: " + childName
-                + " already have a parent Table=" + childParents.stream().findFirst().get());
+                + " already have a parent Table=" + childParents.stream().findFirst().get().getName());
         }
 
         // Validation to prevent creating a child table as a parent of another child table
         final Set<ParentInfo> parentParents = getParents(parentName);
         if (!parentParents.isEmpty()) {
             throw new ParentChildRelServiceException("Cannot create a child table as parent "
                 + "- parent table: " + parentName
-                + " already have a parent table = " + parentParents.stream().findFirst().get());
+                + " already have a parent table = " + parentParents.stream().findFirst().get().getName());
         }
 
         // Validation to prevent creating a parent on top of a table that have children