SPARK-4507: PR merge script should support closing multiple JIRA tickets

This will fix SPARK-4507.

For pull requests that reference multiple JIRAs in their titles, it would be helpful if the PR merge script offered to close all of them.

Author: Takayuki Hasegawa <takayuki.hasegawa0311@gmail.com>

Closes #3428 from hase1031/SPARK-4507 and squashes the following commits:

bf6d64b [Takayuki Hasegawa] SPARK-4507: try to resolve issue when no JIRAs in title
401224c [Takayuki Hasegawa] SPARK-4507: moved codes as before
ce89021 [Takayuki Hasegawa] SPARK-4507: PR merge script should support closing multiple JIRA tickets

dev/merge_spark_pr.py

@@ -214,15 +214,10 @@ def fix_version_from_branch(branch, versions):
         return filter(lambda x: x.name.startswith(branch_ver), versions)[-1]
 
 
-def resolve_jira(title, merge_branches, comment):
+def resolve_jira_issue(merge_branches, comment, default_jira_id=""):
     asf_jira = jira.client.JIRA({'server': JIRA_API_BASE},
                                 basic_auth=(JIRA_USERNAME, JIRA_PASSWORD))
 
-    default_jira_id = ""
-    search = re.findall("SPARK-[0-9]{4,5}", title)
-    if len(search) > 0:
-        default_jira_id = search[0]
-
     jira_id = raw_input("Enter a JIRA id [%s]: " % default_jira_id)
     if jira_id == "":
         jira_id = default_jira_id
@@ -280,6 +275,15 @@ def resolve_jira(title, merge_branches, comment):
     print "Succesfully resolved %s with fixVersions=%s!" % (jira_id, fix_versions)
 
 
+def resolve_jira_issues(title, merge_branches, comment):
+    jira_ids = re.findall("SPARK-[0-9]{4,5}", title)
+
+    if len(jira_ids) == 0:
+        resolve_jira_issue(merge_branches, comment)
+    for jira_id in jira_ids:
+        resolve_jira_issue(merge_branches, comment, jira_id)
+
+
 branches = get_json("%s/branches" % GITHUB_API_BASE)
 branch_names = filter(lambda x: x.startswith("branch-"), [x['name'] for x in branches])
 # Assumes branch names can be sorted lexicographically
@@ -338,7 +342,7 @@ if JIRA_IMPORTED:
     if JIRA_USERNAME and JIRA_PASSWORD:
         continue_maybe("Would you like to update an associated JIRA?")
         jira_comment = "Issue resolved by pull request %s\n[%s/%s]" % (pr_num, GITHUB_BASE, pr_num)
-        resolve_jira(title, merged_refs, jira_comment)
+        resolve_jira_issues(title, merged_refs, jira_comment)
     else:
         print "JIRA_USERNAME and JIRA_PASSWORD not set"
         print "Exiting without trying to close the associated JIRA."