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Apache Impala v4.0 Documentation
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Concepts and Architecture
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2021-07-19 23:10:12
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Using Impala to Query Kudu Tables
Resource Management
Admission Control and Query Queuing
Configuring Admission Control
ADLS Tables
S3 Tables
Deployment Planning
Designing Schemas
Requirements
Introducing Apache Impala
Tutorials
HBase Tables
Installing Impala
Logging
Managing Impala
Post-Installation Configuration for Impala
Performance Tuning
EXPLAIN Plans and Query Profiles
Controlling Resource Usage
Table and Column Statistics
Testing Impala Performance
Benchmarking
Performance Best Practices
Runtime Filtering
HDFS Block Skew
Join Performance
Data Cache for Remote Reads
HDFS Caching
Ports Used by Impala
Client Access
Configuring Impala to Work with ODBC
Configuring Impala to Work with JDBC
Spooling Impala Query Results
The Impala Shell
Connecting to impalad
Configuration Options
Command Reference
Running Commands and SQL Statements
Impala Release Notes
Fixed Issues in Apache Impala
Incompatible Changes and Limitations in Apache Impala
New Features in Apache Impala
Known Issues and Workarounds in Impala
Concepts and Architecture
Developing Applications
Components
Role in the Hadoop Ecosystem
Troubleshooting Impala
Web User Interface
Breakpad Minidumps
Fault Tolerance
Impala Transparent Query Retries
Impala Node Blacklisting
Impala Frequently Asked Questions
Scalability Considerations
Scaling Limits and Guidelines
Dedicated Coordinators Optimization
Metadata Management
Partitioning
SQL Reference
SQL Differences Between Impala and Hive
SQL Operators
Schema Objects and Object Names
Tables
Views
Aliases
Identifiers
Functions
Databases
Porting SQL
Built-In Functions
Miscellaneous Functions
String Functions
Type Conversion Functions
Aggregate Functions
STDDEV, STDDEV_SAMP, STDDEV_POP
VARIANCE, VARIANCE_SAMP, VARIANCE_POP, VAR_SAMP, VAR_POP
COUNT
MAX
MIN
SUM
NDV
AVG
GROUP_CONCAT
APPX_MEDIAN
Bit Functions
Conditional Functions
Date and Time Functions
Mathematical Functions
Analytic Functions
User-Defined Functions (UDFs)
SQL Statements
DELETE
ALTER DATABASE
UPSERT
SELECT
ORDER BY Clause
WITH Clause
HAVING Clause
Subqueries
UNION Clause
TABLESAMPLE Clause
GROUP BY Clause
Joins
LIMIT Clause
DISTINCT Operator
OFFSET Clause
CREATE DATABASE
Optimizer Hints
VALUES
USE
REFRESH FUNCTIONS
COMPUTE STATS
DDL Statements
DML Statements
REFRESH
INVALIDATE METADATA
CREATE ROLE
SHOW
DROP FUNCTION
DROP STATS
UPDATE
REVOKE
GRANT
CREATE TABLE
LOAD DATA
ALTER TABLE
DROP VIEW
DESCRIBE
DROP ROLE
TRUNCATE TABLE
EXPLAIN
CREATE FUNCTION
DROP TABLE
SHUTDOWN
REFRESH AUTHORIZATION
COMMENT
DROP DATABASE
INSERT
SET
Query Options for the SET Statement
DEFAULT_SPILLABLE_BUFFER_SIZE
RESOURCE_TRACE_RATIO
PARQUET_READ_STATISTICS
RUNTIME_FILTER_MIN_SIZE
TIMEZONE
LIVE_SUMMARY
DEBUG_ACTION
DISABLE_UNSAFE_SPILLS
HBASE_CACHING
SCAN_BYTES_LIMIT
ALLOW_ERASURE_CODED_FILES
IDLE_SESSION_TIMEOUT
MAX_ERRORS
SHUFFLE_DISTINCT_EXPRS
SUPPORT_START_OVER
NUM_SCANNER_THREADS
MAX_SPILLED_RESULT_SPOOLING_MEM
MIN_SPILLABLE_BUFFER_SIZE
RETRY_FAILED_QUERIES
BUFFER_POOL_LIMIT
MT_DOP
NUM_ROWS_PRODUCED_LIMIT
PARQUET_ARRAY_RESOLUTION
RUNTIME_FILTER_WAIT_TIME_MS
SYNC_DDL
MAX_ROW_SIZE
PARQUET_PAGE_ROW_COUNT_LIMIT
COMPUTE_STATS_MIN_SAMPLE_SIZE
COMPRESSION_CODEC
PARQUET_DICTIONARY_FILTERING
PARQUET_FILE_SIZE
KUDU_READ_MODE
REFRESH_UPDATED_HMS_PARTITIONS
DELETE_STATS_IN_TRUNCATE
HBASE_CACHE_BLOCKS
REQUEST_POOL
DISABLE_CODEGEN
THREAD_RESERVATION_AGGREGATE_LIMIT
MAX_MEM_ESTIMATE_FOR_ADMISSION
EXEC_SINGLE_NODE_ROWS_THRESHOLD
PARQUET_FALLBACK_SCHEMA_RESOLUTION
EXPLAIN_LEVEL
MAX_NUM_RUNTIME_FILTERS
TOPN_BYTES_LIMIT
REPLICA_PREFERENCE
DEFAULT_FILE_FORMAT
BROADCAST_BYTES_LIMIT
ENABLE_EXPR_REWRITES
DISABLE_CODEGEN_ROWS_THRESHOLD
JOIN_ROWS_PRODUCED_LIMIT
DISABLE_ROW_RUNTIME_FILTERING
DECIMAL_V2
PARQUET_WRITE_PAGE_INDEX
SCRATCH_LIMIT
S3_SKIP_INSERT_STAGING
DISABLE_STREAMING_PREAGGREGATIONS
MEM_LIMIT
RUNTIME_FILTER_MAX_SIZE
SCHEDULE_RANDOM_REPLICA
PARQUET_COMPRESSION_CODEC
RUNTIME_FILTER_MODE
SPOOL_QUERY_RESULTS
NUM_NODES
MAX_SCAN_RANGE_LENGTH
OPTIMIZE_PARTITION_KEY_SCANS
DISABLE_HBASE_NUM_ROWS_ESTIMATE
PARQUET_ANNOTATE_STRINGS_UTF8
FETCH_ROWS_TIMEOUT_MS
PREFETCH_MODE
DEFAULT_TRANSACTIONAL_TYPE
EXEC_TIME_LIMIT_S
DEFAULT_JOIN_DISTRIBUTION_MODE
PARQUET_OBJECT_STORE_SPLIT_SIZE
BATCH_SIZE
THREAD_RESERVATION_LIMIT
ABORT_ON_ERROR
QUERY_TIMEOUT_S
LIVE_PROGRESS
MAX_RESULT_SPOOLING_MEM
PARQUET_READ_PAGE_INDEX
RUNTIME_BLOOM_FILTER_SIZE
APPX_COUNT_DISTINCT
DEFAULT_HINTS_INSERT_STATEMENT
ALLOW_UNSUPPORTED_FORMATS
CREATE VIEW
ALTER VIEW
Transactions
Comments
Data Types
Complex Types (Impala 2.3 or higher only)
DOUBLE
BIGINT
MAP Complex Type (Impala 2.3 or higher only)
STRUCT Complex Type (Impala 2.3 or higher only)
INT
SMALLINT
FLOAT
TINYINT
REAL
VARCHAR
CHAR
DATE
STRING
ARRAY Complex Type (Impala 2.3 or higher only)
TIMESTAMP
Customizing Time Zones
DECIMAL
BOOLEAN
Literals
Starting Impala
Modifying Impala Startup Options
File Formats
Parquet Data Files
Text Data Files
Avro Data Files
RCFile Data Files
Hudi Data Files
ORC Data Files
SequenceFile Data Files
Administration
Setting Timeouts
Load-Balancing Proxy for HA
Managing Disk Space
Impala Reserved Words
Isilon Storage
Impala Security
Securing Impala Data and Log Files
Auditing
Security Guidelines for Impala
Viewing Lineage Info
Impala Authentication
Enabling LDAP Authentication for Impala
Configuring Impala Delegation for Clients
Enabling Kerberos Authentication for Impala
Using Multiple Authentication Methods with Impala
Installation Considerations for Impala Security
Impala Authorization
Securing the Impala Web User Interface
Securing the Hive Metastore Database
Configuring TLS/SSL for Impala
Upgrading Impala
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