linq4j | A port of LINQ to Java | Database library
kandi X-RAY | linq4j Summary
kandi X-RAY | linq4j Summary
A port of LINQ (Language-Integrated Query) to Java.
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Top functions reviewed by kandi - BETA
- Visits a unary expression
- Visit a conditional statement
- Translates binary expression into boolean expression
- Translates a ternary expression into a ternary expression
- Read a value from a source
- Sends an array item to a specified sink
- Get a value from an array
- Sends a value to a given sink
- Sends a single field value to the specified sink
- Sorts a range of an array
- Sorts an array of primitive types
- Convert an array to its string representation
- Append an expression
- Compares two class declarations
- Evaluates the expression
- Evaluates the expression
- Implements the hashCode of this method
- Compares two method declarations
- Append a function to the writer
- Returns a list that contains only elements that match the predicate
- Returns a value from a JDBC ResultSet
- Joins the given list of expressions into an AND expression
- Moves the next element in the enumeration
- Sends a value from a JDBC result set
- Converts collection of Number to primitive array
- Joins the given list of expressions into the OR condition
- Converts a collection of boxed primitives to an array of primitives
linq4j Key Features
linq4j Examples and Code Snippets
Community Discussions
Trending Discussions on linq4j
QUESTION
I am trying to connect Gemfire 8.2 using apache calcite geode adopter. As per following logs its connectied properly but while try to execute query getting exception .
Note : http://calcite.apache.org/news/2018/03/19/release-1.16.0/
Moreover, a new adapter to read data from Apache Geode was added in this release. In addition, more progress has been made for the existing adapters
1) Connection class
...ANSWER
Answered 2018-Mar-21 at 16:51The Geode Adapter is compiled with Geode version: 1.3 (https://github.com/apache/calcite/blob/master/pom.xml#L79) that corresponds to Gemfire 9.x.
Because the Gemfire 8.x is code incompatible with Gemfire 9.x. you would not be able to use the Geode Adapter on the Gemfire 8.x or older. Furthermore the OQL in Gemfire 8.x doesn't support GROUP BY construct either.
QUESTION
Following https://calcite.apache.org/docs/tutorial.html, I ran Apache Calcite using SqlLine. I tried activating tracing as instructed in https://calcite.apache.org/docs/howto.html#tracing. However, I don't get any logging. Here is the content of my session (hopefully containing all relevant information):
...ANSWER
Answered 2019-Jun-18 at 08:29I have the impression that problem lies to the underlying implementation of the logger.
I am not an expert on logging configurations but I think specifying the properties file through -Djava.util.logging.config.file does not have any effect since the logger that is used (according to the classpath you provided) is the Log4J implementation (slf4j-log4j12-1.7.25.jar) and not the one of the jdk (https://mvnrepository.com/artifact/org.slf4j/slf4j-jdk14/1.7.26).
I think that the right property to use for the log4j implementation is the folowing:
-Dlog4j.configuration=file:C:\Users\user0\workspaces\apache-projects\apache-calcite\core\src\test\resources\log4j.properties
QUESTION
I'm trying to use Calcite to query MySql and Vertica in the same query:
MySql table: CREATE TABLE tableA (id INT(11), name VARCHAR(5), PRIMARY KEY(id));
Vertica table: CREATE TABLE tableB (id INTEGER NOT NULL, name VARCHAR(20), PRIMARY KEY (id));
When running the following query using Calcite:
...ANSWER
Answered 2017-Nov-15 at 12:09Solved by casting the id in B:
QUESTION
When I am trying to run datastax spark-sql-thriftserver, I am getting these errors:
...ANSWER
Answered 2017-May-24 at 03:33Looking at org.apache.hive.service.cli.operation.LogDivertAppender.(LogDivertAppender.java:166) shows the following line:
QUESTION
I am using linq4j. I am only sorting by one property and would like to sort by multiple property. If is is not supported in linq4j than what other method I can use. Following is my code snippet,
...ANSWER
Answered 2017-Mar-10 at 08:40You can have multiple order by in linq4j. Check the following example
QUESTION
Below are my codes. I faced a issue with HiveContext.
ANSWER
Answered 2017-Feb-23 at 07:35You are getting java.lang.ClassNotFoundException error because you are adding wrong dependency - "spark-hivecontext-compatibility_2.10". Your pom.xml file should have below dependency.
QUESTION
This is my query below which i am running, but i am getting an exception. I kept all jars in hive/lib folder but still i am facing this issue. Can anyone give me suggestion how to solve this. Thanks in advance.
...ANSWER
Answered 2017-Jan-16 at 09:52From the stacktrace,
Caused by : java.lang.NoClassDefFoundError: io/netty/channel/EventLoopGroup
The netty-3.7.0.Final.jardoes not come with this class. Replace this with a latest (>=4.0) version of netty-all-4.0.x.Final.jar.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install linq4j
You can use linq4j like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the linq4j component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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