#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2019-12-10 11:33:52 +0000 (Tue, 10 Dec 2019)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

# Lists all Impala tables in all databases using adjacent impala_shell.sh script
#
# FILTER environment variable will restrict to matching fully qualified tables (<db>.<table>)
#
# Tested on Impala 2.7.0, 2.12.0 on CDH 5.10, 5.16 with Kerberos and SSL
#
# For more documentation see the comments at the top of impala_shell.sh

# For a better version written in Python see DevOps Python tools repo:
#
# https://github.com/harisekhon/devops-python-tools

# you will need to comment out / remove '-o pipefail' below to skip errors if you aren't authorized to use
# any of the databases to avoid the script exiting early upon encountering any authorization error such:
#
# ERROR: AuthorizationException: User '<user>@<domain>' does not have privileges to access: default   Default Hive database.*.*
#
set -eu -o pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(dirname "$0")"

"$srcdir/impala_list_databases.sh" |
while read -r db; do
    "$srcdir/impala_shell.sh" --quiet -Bq "SHOW TABLES IN \`$db\`" "$@" |
    sed "s/^/$db	/"
done |
while read -r db table; do
    if [ -n "${FILTER:-}" ] &&
       ! [[ "$db.$table" =~ $FILTER ]]; then
        continue
    fi
    printf '%s\t%s\n' "$db" "$table"
done