Jasper Report merging cells in jasper table results in unwanted coulmn - jasper-reports

Question

i am fairly new to jasper report. I need to merge cells in jasper table and i have managed some portion of it. See following image.
as u can see that the there is empty cells. I need a single cells instead of multiple empty cells. Can you guys help me with me. I am stuck. I am posting my jrxml
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="9c6d12ac-438a-4209-b92b-fe8357e9a0ab">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="2"/>
<style name="table">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<style name="table_TH" mode="Opaque" backcolor="#F0F8FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table_CH" mode="Opaque" backcolor="#BFE1FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table_TD" mode="Opaque" backcolor="#FFFFFF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<subDataset name="medication" uuid="540773d1-98fb-48a3-9b89-a187c3e37e8a">
<queryString language="SQL">
<![CDATA[SELECT m.ID,m.medication_name,d.dose_time FROM medication m
LEFT JOIN dose_time d ON m.ID = d.medication_id;]]>
</queryString>
<field name="ID" class="java.lang.Integer">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="medication_name" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="dose_time" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<group name="ID">
<groupExpression><![CDATA[$F{ID}]]></groupExpression>
</group>
</subDataset>
<queryString>
<![CDATA[select mdt.ID,mdt.medication_name,dt.dose_time from medication mdt left join dose_time dt on mdt.ID = dt.medication_id;]]>
</queryString>
<field name="ID" class="java.lang.Integer">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="medication_name" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="dose_time" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<columnHeader>
<band height="61" splitType="Stretch"/>
</columnHeader>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement uuid="b80b6480-79a3-4c7a-b7e6-73e8df552d6a" key="table" style="table" x="0" y="0" width="555" height="125">
<printWhenExpression><![CDATA[$V{REPORT_COUNT} == 1]]></printWhenExpression>
</reportElement>
<jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
<datasetRun subDataset="medication" uuid="966ad176-a042-4a9f-b4fe-3c5cf2c43370">
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
</datasetRun>
<jr:column width="90" uuid="1674ad29-29a8-47d3-9bf9-fb233d836dcc">
<jr:groupFooter groupName="ID">
<jr:cell height="0" rowSpan="1"/>
</jr:groupFooter>
<jr:columnHeader style="table_CH" height="32" rowSpan="1">
<staticText>
<reportElement uuid="1e2c5349-4cc9-4caf-9d7f-ac34dfbdb1b4" x="0" y="0" width="90" height="30"/>
<textElement/>
<text><![CDATA[Medication Name]]></text>
</staticText>
</jr:columnHeader>
<jr:detailCell height="30" rowSpan="1">
<textField>
<reportElement uuid="cfeb2bce-6f8d-413c-8f4e-cfbe61cc2d24" style="table_TD" x="0" y="0" width="90" height="30">
<printWhenExpression><![CDATA[$V{ID_COUNT}==1]]></printWhenExpression>
</reportElement>
<box leftPadding="0">
<pen lineWidth="0.5"/>
<topPen lineWidth="0.5"/>
<leftPen lineWidth="0.5"/>
<bottomPen lineWidth="0.5"/>
<rightPen lineWidth="0.5"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{ID}+$F{medication_name}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="90" uuid="193e3bc0-bdba-42ec-824a-cb0e7b37b7d1">
<jr:columnHeader style="table_CH" height="32" rowSpan="1">
<staticText>
<reportElement uuid="c165e681-8db2-49af-9046-e3db70bfe0cf" x="0" y="0" width="90" height="30"/>
<textElement/>
<text><![CDATA[Doses Time]]></text>
</staticText>
</jr:columnHeader>
<jr:detailCell style="table_TD" height="30" rowSpan="1">
<textField>
<reportElement uuid="78fff516-49ab-4e1d-aa06-4c97d48bad0d" x="0" y="0" width="90" height="30"/>
<textElement/>
<textFieldExpression><![CDATA[$F{dose_time}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
</band>
</detail>
</jasperReport>

Answer 1

I see two possible solutions here:
Create a group band and group by "Medication Name" you will have empty cells but it will look cool :)
Use some SQL kung-fu with the function concat_ws() to get the "Doses Time" in the same field as a list.
Have fun and I hope it helps.