https:\/\/toutiao.io\/posts\/ch6ftkn\/preview<\/a><\/p>\n\n\n\n hive\u5230presto\u7684\u53d8\u5316 https:\/\/toutiao.io\/posts\/ch6ftkn\/preview Key not present in maphive\u4e2d\u9047\u5230\u4e0d\u5b58\u5728\u7684key\u4f1a\u8fd4\u56denull\uff0c...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[31],"class_list":["post-1145","post","type-post","status-publish","format-standard","hentry","category-10","tag-sql"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1145"}],"version-history":[{"count":1,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1145\/revisions"}],"predecessor-version":[{"id":1146,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1145\/revisions\/1146"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Key not present in map<\/code>
hive\u4e2d\u9047\u5230\u4e0d\u5b58\u5728\u7684key\u4f1a\u8fd4\u56denull\uff0c\u800cpresto\u4f1a\u62a5\u9519\u3002
\u89e3\u51b3\u65b9\u6cd5\u662fpresto\u4e2d\u7528element_at\u53d6\u503c\uff0c\u5e76\u5224\u65ad\u662f\u5426\u4e3anull\uff1a https:\/\/stackoverflow.com\/questions\/55426024\/checking-if-key-exists-in-presto-value-map<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"