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Apache Impala v3.x Documentation
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ADLS Tables
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2021-07-20 00:14:47
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Impala Release Notes
New Features in Apache Impala
Known Issues and Workarounds in Impala
Incompatible Changes and Limitations in Apache Impala
Fixed Issues in Apache Impala
Ports Used by Impala
Introducing Apache Impala
Starting Impala
Modifying Impala Startup Options
HBase Tables
Impala Frequently Asked Questions
Installing Impala
Troubleshooting Impala
Web User Interface
Breakpad Minidumps
SQL Reference
Schema Objects and Object Names
Views
Functions
Tables
Aliases
Identifiers
Databases
Built-In Functions
Miscellaneous Functions
Impala User-Defined Functions (UDFs)
Type Conversion Functions
Conditional Functions
Aggregate Functions
NDV
MIN
STDDEV, STDDEV_SAMP, STDDEV_POP
AVG
COUNT
SUM
APPX_MEDIAN
MAX
GROUP_CONCAT
VARIANCE, VARIANCE_SAMP, VARIANCE_POP, VAR_SAMP, VAR_POP
String Functions
Date and Time Functions
Bit Functions
Analytic Functions
Mathematical Functions
Literals
SQL Statements
ALTER VIEW
SET
Query Options for the SET Statement
ALLOW_UNSUPPORTED_FORMATS
PARQUET_COMPRESSION_CODEC
DEFAULT_JOIN_DISTRIBUTION_MODE
LIVE_SUMMARY
RUNTIME_FILTER_MODE
NUM_NODES
ABORT_ON_ERROR
RUNTIME_FILTER_WAIT_TIME_MS
DISABLE_UNSAFE_SPILLS
PARQUET_ANNOTATE_STRINGS_UTF8
SCRATCH_LIMIT
RUNTIME_FILTER_MIN_SIZE
MAX_SCAN_RANGE_LENGTH
PARQUET_FILE_SIZE
DISABLE_ROW_RUNTIME_FILTERING
MIN_SPILLABLE_BUFFER_SIZE
RUNTIME_FILTER_MAX_SIZE
PREFETCH_MODE
DISABLE_STREAMING_PREAGGREGATIONS
SUPPORT_START_OVER
MAX_NUM_RUNTIME_FILTERS
OPTIMIZE_PARTITION_KEY_SCANS
BATCH_SIZE
SYNC_DDL
BUFFER_POOL_LIMIT
HBASE_CACHING
LIVE_PROGRESS
NUM_SCANNER_THREADS
REQUEST_POOL
EXEC_TIME_LIMIT_S
MAX_ROW_SIZE
EXPLAIN_LEVEL
HBASE_CACHE_BLOCKS
DEBUG_ACTION
RUNTIME_BLOOM_FILTER_SIZE
REPLICA_PREFERENCE
PARQUET_ARRAY_RESOLUTION
DISABLE_CODEGEN
S3_SKIP_INSERT_STAGING
APPX_COUNT_DISTINCT
QUERY_TIMEOUT_S
SCHEDULE_RANDOM_REPLICA
PARQUET_FALLBACK_SCHEMA_RESOLUTION
SHUFFLE_DISTINCT_EXPRS
DEFAULT_SPILLABLE_BUFFER_SIZE
COMPUTE_STATS_MIN_SAMPLE_SIZE
MAX_ERRORS
COMPRESSION_CODEC
MEM_LIMIT
DECIMAL_V2
MT_DOP
EXEC_SINGLE_NODE_ROWS_THRESHOLD
CREATE TABLE
INVALIDATE METADATA
CREATE VIEW
CREATE DATABASE
EXPLAIN
ALTER TABLE
DML Statements
REVOKE
UPSERT
DESCRIBE
DDL Statements
UPDATE
DROP ROLE
DELETE
SHOW
CREATE FUNCTION
DROP STATS
DROP DATABASE
COMPUTE STATS
SELECT
UNION Clause
LIMIT Clause
OFFSET Clause
Subqueries
HAVING Clause
DISTINCT Operator
TABLESAMPLE Clause
WITH Clause
ORDER BY Clause
Joins
GROUP BY Clause
USE
TRUNCATE TABLE
GRANT
DROP TABLE
DROP FUNCTION
Optimizer Hints
LOAD DATA
CREATE ROLE
REFRESH
DROP VIEW
INSERT
Data Types
TINYINT
BOOLEAN
MAP Complex Type (Impala 2.3 or higher only)
SMALLINT
FLOAT
Complex Types (Impala 2.3 or higher only)
TIMESTAMP
ARRAY Complex Type (Impala 2.3 or higher only)
DOUBLE
VARCHAR
DECIMAL
CHAR
REAL
STRING
STRUCT Complex Type (Impala 2.3 or higher only)
INT
BIGINT
Comments
SQL Operators
Porting SQL
SQL Differences Between Impala and Hive
Upgrading Impala
The Impala Shell
Connecting to impalad
Command Reference
Running Commands and SQL Statements
Configuration Options
Isilon Storage
Administration
Load-Balancing Proxy for HA
Setting Timeouts
Managing Disk Space
Admission Control and Query Queuing
Resource Management for Impala
Impala Reserved Words
Scalability Considerations
S3 Tables
Concepts and Architecture
Role in the Hadoop Ecosystem
Components
Developing Applications
Performance Tuning
Runtime Filtering
Testing Impala Performance
Controlling Resource Usage
EXPLAIN Plans and Query Profiles
Performance Best Practices
Table and Column Statistics
HDFS Caching
Benchmarking
Join Performance
HDFS Block Skew
Deployment Planning
Designing Schemas
Requirements
Managing Impala
Configuring Impala to Work with ODBC
Configuring Impala to Work with JDBC
Post-Installation Configuration for Impala
Using Impala to Query Kudu Tables
Tutorials
ADLS Tables
Partitioning
Logging
File Formats
SequenceFile Data Files
Text Data Files
RCFile Data Files
Parquet Data Files
Avro Data Files
Impala Security
Securing Impala Data and Log Files
Securing the Hive Metastore Database
Viewing Lineage Info
Configuring TLS/SSL for Impala
Impala Authentication
Configuring Impala Delegation for Hue and BI Tools
Using Multiple Authentication Methods with Impala
Enabling LDAP Authentication for Impala
Enabling Kerberos Authentication for Impala
Securing the Impala Web User Interface
Security Guidelines for Impala
Installation Considerations for Impala Security
Auditing
Enabling Sentry Authorization for Impala
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