asterix-bad/src/main/java/org/apache/asterix/bad/lang/statement/ChannelSubscribeStatement.java [135:141]:
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        MetadataTransactionContext mdTxnCtx = null;
        try {
            mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();

            Channel channel = BADLangExtension.getChannel(mdTxnCtx, dataverse, channelName.getValue());
            if (channel == null) {
                throw new AsterixException("There is no channel with this name " + channelName + ".");
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asterix-bad/src/main/java/org/apache/asterix/bad/lang/statement/ChannelUnsubscribeStatement.java [113:119]:
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        MetadataTransactionContext mdTxnCtx = null;
        try {
            mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();

            Channel channel = BADLangExtension.getChannel(mdTxnCtx, dataverse, channelName.getValue());
            if (channel == null) {
                throw new AsterixException("There is no channel with this name " + channelName + ".");
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