spark-instrumented-optimizer/docs/sql-ref-syntax-dml-load.md

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Description

LOAD DATA statement loads the data into a Hive serde table from the user specified directory or file. If a directory is specified then all the files from the directory are loaded. If a file is specified then only the single file is loaded. Additionally the LOAD DATA statement takes an optional partition specification. When a partition is specified, the data files (when input source is a directory) or the single file (when input source is a file) are loaded into the partition of the target table.

Syntax

LOAD DATA [ LOCAL ] INPATH path [ OVERWRITE ] INTO TABLE table_identifier [ partition_spec ]

Parameters

• path

  Path of the file system. It can be either an absolute or a relative path.

• table_identifier

  Specifies a table name, which may be optionally qualified with a database name.

  Syntax: [ database_name. ] table_name

• partition_spec

  An optional parameter that specifies a comma separated list of key and value pairs for partitions.

  Syntax: PARTITION ( partition_col_name = partition_col_val [ , ... ] )

• LOCAL

  If specified, it causes the INPATH to be resolved against the local file system, instead of the default file system, which is typically a distributed storage.

• OVERWRITE

  By default, new data is appended to the table. If OVERWRITE is used, the table is instead overwritten with new data.

Examples

-- Example without partition specification.
-- Assuming the students table has already been created and populated.
SELECT * FROM students;
+---------+----------------------+----------+
|     name|               address|student_id|
+---------+----------------------+----------+
|Amy Smith|123 Park Ave, San Jose|    111111|
+---------+----------------------+----------+

CREATE TABLE test_load (name VARCHAR(64), address VARCHAR(64), student_id INT) USING HIVE;

-- Assuming the students table is in '/user/hive/warehouse/'
LOAD DATA LOCAL INPATH '/user/hive/warehouse/students' OVERWRITE INTO TABLE test_load;

SELECT * FROM test_load;
+---------+----------------------+----------+
|     name|               address|student_id|
+---------+----------------------+----------+
|Amy Smith|123 Park Ave, San Jose|    111111|
+---------+----------------------+----------+

-- Example with partition specification.
CREATE TABLE test_partition (c1 INT, c2 INT, c3 INT) PARTITIONED BY (c2, c3);

INSERT INTO test_partition PARTITION (c2 = 2, c3 = 3) VALUES (1);

INSERT INTO test_partition PARTITION (c2 = 5, c3 = 6) VALUES (4);

INSERT INTO test_partition PARTITION (c2 = 8, c3 = 9) VALUES (7);

SELECT * FROM test_partition;
+---+---+---+
| c1| c2| c3|
+---+---+---+
|  1|  2|  3|
|  4|  5|  6|
|  7|  8|  9|
+---+---+---+

CREATE TABLE test_load_partition (c1 INT, c2 INT, c3 INT) USING HIVE PARTITIONED BY (c2, c3);

-- Assuming the test_partition table is in '/user/hive/warehouse/'
LOAD DATA LOCAL INPATH '/user/hive/warehouse/test_partition/c2=2/c3=3'
    OVERWRITE INTO TABLE test_load_partition PARTITION (c2=2, c3=3);

SELECT * FROM test_load_partition;
+---+---+---+
| c1| c2| c3|
+---+---+---+
|  1|  2|  3|
+---+---+---+