OMOP/Impala/README.md

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Common-Data-Model / Impala
=================
This folder contains the SQL scripts for Impala.
In order to create your instantiation of the Common Data Model, we recommend following these steps:
1. Create an empty schema.
```bash
impala-shell -q 'CREATE DATABASE omop_cdm'
```
2. Execute the script `OMOP_CDM_ddl_Impala.sql` to create the tables and fields.
```bash
impala-shell -d omop_cdm -f OMOP_CDM_ddl_Impala.sql
```
3. Load your data into the schema.
a. Load the vocabulary tables.
First, download the data from
[http://www.ohdsi.org/web/athena/](http://www.ohdsi.org/web/athena/)
and unzip into a _cdmv5vocab_ directory, then run
```bash
hadoop fs -put cdmv5vocab cdmv5vocab
hadoop fs -chmod +w cdmv5vocab
impala-shell -d omop_cdm -f VocabImport/OMOP_CDM_vocabulary_load_Impala.sql --var=OMOP_VOCAB_PATH=/user/$USER/cdmv5vocab
```
b. Load the patient data.
For example, download the 1000 person sample of simulated CMS SynPUF patient data from
[http://www.ltscomputingllc.com/downloads/](http://www.ltscomputingllc.com/downloads/)
and unzip into a _synpuf_ directory, then run
```bash
hadoop fs -put synpuf synpuf
hadoop fs -chmod +w synpuf
impala-shell -d omop_cdm -f DataImport/OMOP_CDM_synpuf_load_Impala.sql --var=OMOP_SYNPUF_PATH=/user/$USER/synpuf
```
4. Convert to Parquet format.
```bash
impala-shell -q 'CREATE DATABASE omop_cdm_parquet'
impala-shell -f OMOP_Parquet.sql
```
5. Run simple queries to sanity check.
```bash
impala-shell -d omop_cdm_parquet -q 'SELECT COUNT(1) FROM concept'
impala-shell -d omop_cdm_parquet -q 'SELECT COUNT(1) FROM person'
```