fix: Fix support for InfluxDB 1.8.x in InfluxQLQueryAPI

[btasker]

Proposed Changes

Switches to sending InfluxQL queries as a urlencoded form-body to ensure compatibility with 1.8.x's InfluxQL implementation.

See (#458)

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[bednar]

Thanks for your PR 👍

Please add test for your changes:

@Test
void testInfluxDB18() {
    // create database
    String db = "testing_database";
    influxDBQuery("CREATE DATABASE " + db, db);

    // connect to InfluxDB 1.8
    influxDBClient.close();
    influxDBClient = InfluxDBClientFactory.createV1(getInfluxDbUrl(), "username", "password".toCharArray(),
            db, "autogen");
    influxQLQueryApi = influxDBClient.getInfluxQLQueryApi();

    // test query to InfluxDB 1.8
    InfluxQLQueryResult result = influxQLQueryApi.query(new InfluxQLQuery("SHOW DATABASES", db));
    assertSingleSeriesRecords(result)
            .map(record -> record.getValueByKey("name"))
            .contains(db);


    // drop database
    influxDBQuery("DROP DATABASE " + db, db);
}

to

influxdb-client-java/client/src/test/java/com/influxdb/client/ITInfluxQLQueryApi.java

Line 135 in 5712b48

[codecov-commenter]

Codecov Report

Base: 88.40% // Head: 88.40% // No change to project coverage 👍

Coverage data is based on head (f748c64) compared to base (f137cd9).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #459   +/-   ##
=========================================
  Coverage     88.40%   88.40%           
  Complexity      777      777           
=========================================
  Files           172      172           
  Lines          7014     7014           
  Branches        378      378           
=========================================
  Hits           6201     6201           
  Misses          693      693           
  Partials        120      120           

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[bednar]

LGTM 🚀