Questions tagged [hive]
Questions about Hive and HiveQL.
31
questions
2
votes
1
answer
75
views
Connecting to cluster with cqlsh returns "Unable to connect to any servers"
I am trying to deploy The Hive 4 on a VMware Workstation 17 player VM to test Splunk integration with The Hive.
I am following the guide at this link, but I encountered an error at one of the stages, ...
- 21
1
vote
1
answer
79
views
Metastore(Mysql) bottleneck for Hive
We have a hive installation that has MariaDB as metastore database. MariaDB has around ~250 GB metadata with ~100GB indexes. It becomes terribly slow during the peak load of 40-60K QPS.
Looking from ...
- 111
1
vote
1
answer
172
views
For each tuple, get the name of the first column which is non-zero
I have a table in Hive which looks like:
| Name | 1990 | 1991 | 1992 | 1993 | 1994 |
| Rex | 0 | 0 | 1 | 1 | 1 |
| Max | 0 | 0 | 0 | 0 | 1 |
| Phil | 1 | 1 | 1 ...
- 113
0
votes
0
answers
52
views
Is there an open source implementation of QGM (Query Graph Model)?
I am building a new system that needs to interact essentially as an SQL backend. We would like to import logical queries into it (e.g. from ApacheSPARQ or Postgres and related things) and want to ...
- 141
1
vote
1
answer
708
views
Getting the row before a row with a certain value in SQL
I have a table like below where user actions are stored with a timestamp. My goal is to identify the action that happened before a specific action (named reference_action) and count the number of ...
- 113
1
vote
1
answer
425
views
How to check total allotted space inside a HDFS 'group'
Our DBA has created a schema for our team in HDFS/HIVE. Not sure if 'schema' is the right word, they call it a 'group'.
Anyway, we can only write to the data lake inside this schema, whether it is ...
- 127
0
votes
0
answers
21
views
Field with Top Ranking Field Name
Let's imagine a table structured like this:
Bucket
Red
Blue
Green
First
1
3
4
Second
6
5
2
What I'm trying to achieve is based on the values within each bucket, I'd like to generate another set of ...
0
votes
1
answer
349
views
I am trying to write a join using temporary table in hive
I am trying to write a join using subquery/ temporary table in hive but it doesn't seem to be working:
create temporary table q as select server, max(time) as time from ghs group by header.server;
...
- 111
0
votes
1
answer
216
views
Creating external tables from SQL Server using JDBC Drivers
I am trying to query Hive tables AND Kylin tables from SQL Server 2019. I was doing some research and found that MSSQL provide PolyBase as a form of interface to Hadoop storage. However, the examples ...
- 101
0
votes
1
answer
5k
views
Testing a Hive array for IS NULL says not null
I have a table containing an array, and I want to check if it is empty or NULL. It appears that I cannot check the NULL directly! Can anyone shed light on why the NULL check isn't working?
create ...
- 539
0
votes
1
answer
374
views
Query fails sometimes on casting error
I have a query that can run on the same data set, and sometimes it fails and sometimes it succeeds
The query is generated by hive metadata service, and I can't modify it.
This is a simplified version ...
- 111
1
vote
0
answers
13
views
Defining external table on JSON with an @ sign in an element
I need to define a Hive external table onto a JSON file that has @ signs in its elements, e.g.
{ "data": { "@type": "person", "name": "Phil", "job": "Programmer" } }
This works:
create external ...
- 539
1
vote
1
answer
7k
views
HIVE SQL [Error 10025]: Expression not in GROUP BY key
Here is my SQL statement:
my_table includes 10+ columns (e.g, day, ip_address, user, request, etc), including strings and numbers. I want to GROUP by & HAVING based on column 'ip_address', if ...
- 127
1
vote
1
answer
205
views
SQL filter only if each unique value has more than N records
Here is my sample SQL statement:
SELECT DAY,
name,
value
FROM my_table
WHERE DAY = '${date}'
GROUP BY DAY
name,
value
ORDER BY name ASC
For example, 3 unique names in ...
- 127
0
votes
1
answer
77
views
Compare running / cumulative total with static target
I have some daily data and monthly data.
I want to compare these two datasets, with Hive and perform a payout when the sum of actual for a month passes that respective months target. In the above ...
- 101
1
vote
0
answers
2k
views
HIVE + understanding the hive-metastore logs
we have HDP cluster version - 2.6.4 , and we are runs spark streaming app
and we are uses presto cluster in order to run Hive queries
when we look on the hivemetastore logs ( under /var/log/hive ) ,...
- 111
0
votes
2
answers
1k
views
Omit table name and dot in SELECT query
When I perform this query:
SELECT `tablename`.* FROM `something`.`tablename`
I get a table with column names that contain dots:
tablename.c1 | tablename.c2 | tablename.c3
---------------------------...
- 101
1
vote
1
answer
532
views
IDE Access to Hive without user password?
I'm a DB Developer and in my company we're only able to interact with hive through a technical user who owns the specific write permissions for Hive on HDFS.
So in practice this looks like this:
I ...
- 181
0
votes
0
answers
354
views
Sum of integers between two rows in Hive
Suppose I have a Hive table that looks like this:
a b
41 77
8 32
31 76
I would like to have another column say c which applies a function that loops through all integers between columns a ...
- 101
0
votes
0
answers
27
views
HIVE SQL - JOIN
I am trying to perform a left join between tables. The syntax looks something like this:
select a.x1, a.x2, a.x3, b.y1 from a left join b on a.x1=b.x1
Ideally, the query should give all records that ...
- 101
0
votes
0
answers
22
views
Join hive tables which are being populated in real time
I have two tables in hive which are being populated in real time from a set of files. There is a request_time and trx_id columns in both tables where trx_id is the joining key.
I want to join them ...
- 101
1
vote
0
answers
2k
views
Hive query with RANK() in a WHERE clause
I want to do this, to get all the rows for a given a,b combo that have the highest value of c:
SELECT a, b, c
FROM x
WHERE RANK() OVER (PARTITION BY a,b ORDER BY c DESC) = 1
It fails, saying invalid ...
- 539
1
vote
1
answer
503
views
"Error while processing statement" running a query finding unique values with multiple values in other rows
Is there anything wrong in the syntax of this query finding unique values with multiple values in other rows?
Select Distinct Ss.`cd`, Ss.`cd`
From nit.assrr As Ss
Join (
Select `cd`
...
2
votes
1
answer
86
views
joining the where clause to select statement of two different tables [closed]
How can I properly structure the below query to make it work? I would like to have the Ref_CD = MBR_ID_TYPE_ID to be my select statement on the beginning of it.
select MBR_ID_TYP_ID || '-' || (
...
- 21
0
votes
1
answer
572
views
User specific default database in Hive
I am running a Oracle Big Data Appliance platform that has Cloudera EDH 5.9.x running under the hood. My users are mainly using beeswax, which is the Hive query editor app within Hue.
When a user ...
1
vote
1
answer
122
views
Hive metrastore Database in Postgresql External [closed]
We recently migrated hive metastore database from embedded postgresql(coming with cloudera hadoop) to external postgresql(standalone in vm server). After that we notified that there is increase of 5 ...
- 483
2
votes
2
answers
3k
views
How can I group the null results in this FULL OUTER JOIN with non-null responses?
I am looking at the overlap and non-overlap (unique values) of users-ids from two different select statements using a full join. The main differentiation being that one table will have a deal_id = 0 ...
- 31
0
votes
1
answer
3k
views
Hive. Over partition by vs where conditions
I have a table partitioned this way.
# Partition Information
# col_name data_type
year string
month string
day string
hour ...
- 103
2
votes
1
answer
1k
views
how to insert data into extra columns of target avro table when source table is having less no of columns compared to target using hive or impala?
Suppose I am having a source Avro table having 10 columns and my target Avro table is having 12 columns, while inserting data into the target table I need to add null values to the extra 2 columns.
...
- 21
5
votes
1
answer
10k
views
Cumulative sum using hiveql
I have a table in Hive which looks like:
col1 col2
b 1
b 2
a 3
b 2
c 4
c 5
How do I, with hiveql, group up col1 elements together, ...
- 53
4
votes
1
answer
5k
views
correlate subquery in hive
SELECT ndo.sku ParentSKU, visitsWhenSKUWasOnline.s
FROM
Temp.NumberOfDaysOnline ndo
JOIN
(
SELECT SUM(gasessiondata.sessions) as s
FROM gasessiondata
WHERE
gasessiondata.date >= ...
- 169