docs/topics/impala_glossary.xml

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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="glossary">

  <title>Impala Glossary</title>
  <prolog>
    <metadata>
      <data name="Category" value="Impala"/>
      <data name="Category" value="Administrators"/>
      <data name="Category" value="Developers"/>
      <data name="Category" value="Data Analysts"/>
    </metadata>
  </prolog>

  <conbody>

    <section id="glos_ddl">

      <title>DDL</title>

      <p>
        A category of SQL statements involving administrative or metadata-related operations. Many of these
        statements start with the keywords <codeph>CREATE</codeph>, <codeph>ALTER</codeph>, or
        <codeph>DROP</codeph>. Contrast with DML.
      </p>
    </section>

    <section id="glos_dml">

      <title>DML</title>

      <p>
        A category of SQL statements that modify table data. Impala has a limited set of DML statements, primarily
        the <codeph>INSERT</codeph> statement. Contrast with DDL.
      </p>
    </section>

    <section id="glos_catalog">

      <title>catalog</title>

      <p></p>
    </section>

    <section id="glos_catalogd">

      <title>catalogd</title>

      <p>
        A daemon.
      </p>
    </section>

    <section id="glos_impalad">

      <title>impalad</title>

      <p>
        A daemon.
      </p>
    </section>

    <section id="glos_statestored">

      <title>statestored</title>

      <p>
        A daemon.
      </p>
    </section>

    <section id="glos_statestore">

      <title>statestore</title>

      <p></p>
    </section>

    <section id="glos_metastore">

      <title>metastore</title>

      <p></p>
    </section>

    <section id="glos_table">

      <title>table</title>

      <p></p>
    </section>

    <section id="glos_database">

      <title>database</title>

      <p></p>
    </section>

    <section id="glos_hive">

      <title>Hive</title>

      <p>
        Its full trademarked name is Apache Hive.
      </p>
    </section>

    <section id="glos_hbase">

      <title>HBase</title>

      <p>
        Its full trademarked name is Apache HBase.
      </p>
    </section>

    <section id="glos_coordinator_node">

      <title>coordinator node</title>

      <p></p>
    </section>

    <section id="glos_sql">

      <title>SQL</title>

      <p>
        An acronym for Structured Query Language, the industry standard language for database operations.
        Implemented by components such as Impala and Hive.
      </p>
    </section>

    <section id="glos_avro">

      <title>Avro</title>

      <p>
        A file format.
      </p>
    </section>

    <section id="glos_text">

      <title>text</title>

      <p>
        A file format.
      </p>
    </section>

    <section id="glos_hdfs">

      <title>HDFS</title>

      <p></p>
    </section>

    <section id="glos_block">

      <title>block</title>

      <p></p>
    </section>

    <section id="glos_parquet">

      <title>Parquet</title>

      <p>
        A file format.
      </p>
    </section>

    <section id="glos_rcfile">

      <title>RCFile</title>

      <p>
        A file format.
      </p>
    </section>

    <section id="glos_sequencefile">

      <title>SequenceFile</title>

      <p>
        A file format.
      </p>
    </section>

    <section id="glos_snappy">

      <title>Snappy</title>

      <p></p>
    </section>

    <section id="glos_file_format">

      <title>file format</title>

      <p></p>
    </section>

    <section id="glos_compression">

      <title>compression</title>

      <p></p>
    </section>

    <section id="glos_codec">

      <title>codec</title>

      <p></p>
    </section>

    <section id="glos_lzo">

      <title>LZO</title>

      <p>
        A compression codec.
      </p>
    </section>

    <section id="glos_gzip">

      <title>gzip</title>

      <p>
        A compression codec.
      </p>
    </section>

    <section id="glos_bzip2">

      <title>BZip2</title>

      <p>
        A compression codec.
      </p>
    </section>

    <section id="glos_sentry">

      <title/>

      <p></p>
    </section>

    <section id="glos_authorization">

      <title>authorization</title>

      <p></p>
    </section>

    <section id="glos_authentication">

      <title>authentication</title>

      <p></p>
    </section>

    <section id="glos_delegation">

      <title>delegation</title>

      <p></p>
    </section>

    <section id="glos_skew">

      <title>skew</title>

      <p></p>
    </section>

    <section id="glos_profile">

      <title>profile</title>

      <p></p>
    </section>

    <section id="glos_query">

      <title>query</title>

      <p></p>
    </section>

    <section id="glos_external_table">

      <title>external table</title>

      <p></p>
    </section>

    <section id="glos_internal_table">

      <title>internal table</title>

      <p></p>
    </section>

    <section id="glos_view">

      <title>view</title>

      <p></p>
    </section>

    <section id="glos_function">

      <title>function</title>

      <p>
        In Impala, a kind of database object that performs customized processing or business logic. The kinds of
        functions include built-in functions, UDFs, and UDAs.
      </p>
    </section>

    <section id="glos_udf">

      <title>UDF</title>

      <p>
        Acronym for user-defined function. In Impala, a function that you write in C++ or Java. A UDF (as opposed
        to a UDA) returns a single scalar value for each row evaluated in the result set. On occasion, UDF is used
        in a broad context to include all kinds of user-written functions, including UDAs.
      </p>
    </section>

    <section id="glos_uda">

      <title>UDA</title>

      <p></p>
    </section>

    <section id="glos_aggregate_function">

      <title>aggregate function</title>

      <p></p>
    </section>

    <section id="glos_built_in_function">

      <title>built-in function</title>

      <p></p>
    </section>

    <section id="glos_analytic_function">

      <title>analytic function</title>

      <p></p>
    </section>

    <section id="glos_admission_control">

      <title>admission control</title>

      <p></p>
    </section>

    <section id="glos_llama">

      <title>llama</title>

      <p></p>
    </section>

    <section id="glos_impala">

      <title>Impala</title>

      <p></p>
    </section>

    <section id="glos_table_statistics">

      <title>table statistics</title>

      <p></p>
    </section>

    <section id="glos_column_statistics">

      <title>column statistics</title>

      <p></p>
    </section>

    <section id="glos_statistics">

      <title>statistics</title>

      <p></p>
    </section>

    <section id="glos_incremental_statistics">

      <title>incremental statistics</title>

      <p></p>
    </section>

    <section id="glos_hdfs_caching">

      <title>HDFS caching</title>

      <p></p>
    </section>

    <section id="glos_join_query">

      <title>join query</title>

      <p></p>
    </section>

    <section id="glos_straight_join">

      <title>straight join</title>

      <p></p>
    </section>

    <section id="glos_inner_join">

      <title>inner join</title>

      <p></p>
    </section>

    <section id="glos_outer_join">

      <title>outer join</title>

      <p></p>
    </section>

    <section id="glos_left_join">

      <title>left join</title>

      <p></p>
    </section>

    <section id="glos_right_join">

      <title>right join</title>

      <p></p>
    </section>

    <section id="glos_equijoin">

      <title>equijoin</title>

      <p></p>
    </section>

    <section id="glos_antijoin">

      <title>antijoin</title>

      <p></p>
    </section>

    <section id="glos_semijoin">

      <title>semijoin</title>

      <p></p>
    </section>

    <section id="glos_cross_join">

      <title>cross join</title>

      <p></p>
    </section>

    <section id="glos_hint">

      <title>hint</title>

      <p></p>
    </section>

    <section id="glos_distinct">

      <title>distinct</title>

      <p></p>
    </section>

    <section id="glos_impala_shell">

      <title>impala-shell</title>

      <p></p>
    </section>

    <section id="glos_odbc">

      <title>ODBC</title>

      <p></p>
    </section>

    <section id="glos_jdbc">

      <title>JDBC</title>

      <p></p>
    </section>

    <section id="glos_data_types">

      <title>data types</title>

      <p></p>
    </section>

    <section id="glos_performance">

      <title>performance</title>

      <p></p>
    </section>

    <section id="glos_scalability">

      <title>scalability</title>

      <p></p>
    </section>

    <section id="glos_hue">

      <title>Hue</title>

      <p></p>
    </section>

    <section id="glos_partition">

      <title>partition</title>

      <p></p>
    </section>

    <section id="glos_partitioning">

      <title>partitioning</title>

      <p></p>
    </section>

    <section id="glos_partitioned_table">

      <title>partitioned table</title>

      <p></p>
    </section>

    <section id="glos_hdfs_trashcan">

      <title>HDFS trashcan</title>

      <p></p>
    </section>

    <section id="glos_explain_plan">

      <title>EXPLAIN plan</title>

      <p></p>
    </section>

    <section id="glos_summary">

      <title>summary</title>

      <p></p>
    </section>

    <section id="glos_executive_summary">

      <title>executive summary</title>

      <p></p>
    </section>

    <section id="glos_alias">

      <title>alias</title>

      <p></p>
    </section>

    <section id="glos_identifier">

      <title>identifier</title>

      <p></p>
    </section>

    <section id="glos_query_option">

      <title>query option</title>

      <p></p>
    </section>

    <section id="glos_daemon">

      <title>daemon</title>

      <p>
        The daemons that make up the Impala service are <cmdname>impalad</cmdname>, <cmdname>statestored</cmdname>,
        and <cmdname>catalogd</cmdname>.
      </p>
    </section>

    <section id="impala_service">

      <title>Impala service</title>

      <p></p>
    </section>

    <section id="glos_session">

      <title>session</title>

      <p></p>
    </section>

    <section id="glos_schema">

      <title>schema</title>

      <p></p>
    </section>

    <section id="glos_schema_evolution">

      <title>schema evolution</title>

      <p></p>
    </section>

    <section id="glos_literal">

      <title>literal</title>

      <p></p>
    </section>

    <section id="glos_string">

      <title>string</title>

      <p>
        String values are represented in Impala by the data types <codeph>STRING</codeph>,
        <codeph>VARCHAR</codeph>, and <codeph>CHAR</codeph>.
      </p>
    </section>

    <section id="glos_number">

      <title>number</title>

      <p>
        Numeric values are represented in Impala by the data types <codeph>INT</codeph>, <codeph>BIGINT</codeph>,
        <codeph>SMALLINT</codeph>, <codeph>TINYINT</codeph>, <codeph>DECIMAL</codeph>, <codeph>DOUBLE</codeph>, and
        <codeph>FLOAT</codeph>.
      </p>
    </section>

    <section id="glos_date_time">

      <title>date/time</title>

      <p>
        Date and time values are represented in Impala by the <codeph>TIMESTAMP</codeph> data type. Sometimes, for
        convenience or as part of a partitioning plan, dates are represented as formatted <codeph>STRING</codeph>
        columns or as separate integer columns for year, month, and day.
      </p>
    </section>

    <section id="glos_cancel">

      <title>cancel</title>

      <p>
        Halting an Impala query before it is completely finished.
      </p>
    </section>

    <section id="glos_streaming">

      <title>streaming</title>

      <p></p>
    </section>

    <section id="glos_sorting">

      <title>sorting</title>

      <p></p>
    </section>

    <section id="glos_aggregation">

      <title>aggregation</title>

      <p></p>
    </section>

    <section id="glos_fragment">

      <title>fragment</title>

      <p></p>
    </section>

    <section id="glos_source">

      <title>source</title>

      <p></p>
    </section>

    <section id="glos_sink">

      <title>sink</title>

      <p></p>
    </section>

    <section id="glos_thrift">

      <title>Thrift</title>

      <p></p>
    </section>

    <section id="glos_delegation">

      <title>delegation</title>

      <p></p>
    </section>

    <section id="glos_authorization">

      <title>authorization</title>

      <p></p>
    </section>

    <section id="glos_authentication">

      <title>authentication</title>

      <p></p>
    </section>

    <section id="glos_partition_pruning">

      <title>partition pruning</title>

      <p></p>
    </section>

    <section id="glos_heartbeat">

      <title>heartbeat</title>

      <p></p>
    </section>

    <section id="glos_subscriber">

      <title>subscriber</title>

      <p></p>
    </section>

    <section id="glos_topic">

      <title>topic</title>

      <p></p>
    </section>

    <section id="glos_broadcast_join">

      <title>broadcast join</title>

      <p></p>
    </section>

    <section id="glos_shuffle_join">

      <title>shuffle join</title>

      <p></p>
    </section>

<!-- Use as a template for new definitions:
    <section id="glos_">
      <title></title>
      <p>
      </p>
    </section>

-->
  </conbody>
</concept>