liquibase-core/src/main/java/liquibase/change/core/CreateViewChange.java
@Override
    public CheckSum generateCheckSum() {
        if (this.path == null) {
            return super.generateCheckSum();
        }

        InputStream stream = null;
        try {
            stream = openSqlStream();
        } catch (IOException e) {
            throw new UnexpectedLiquibaseException(e);
        }

        try {
            String selectQuery = this.selectQuery;
            if ((stream == null) && (selectQuery == null)) {
                selectQuery = "";
            }

            String encoding = LiquibaseConfiguration.getInstance().getConfiguration(GlobalConfiguration.class).getOutputEncoding();
            if (selectQuery != null) {
                try {
                    stream = new ByteArrayInputStream(selectQuery.getBytes(encoding));
                } catch (UnsupportedEncodingException e) {
                    throw new AssertionError(encoding+" is not supported by the JVM, this should not happen according to the JavaDoc of the Charset class");
                }
            }

			CheckSum checkSum = CheckSum.compute(new AbstractSQLChange.NormalizingStream(";", false, false, stream), false);

            return CheckSum.compute(super.generateCheckSum().toString() + ":" + checkSum.toString());
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException ignore) {
                }
            }
        }

    }
@Override
    public CheckSum generateCheckSum() {
        if (this.path == null) {
            return super.generateCheckSum();
        }

        InputStream stream = null;
        try {
            stream = openSqlStream();
        } catch (IOException e) {
            throw new UnexpectedLiquibaseException(e);
        }

        try {
            String selectQuery = this.selectQuery;
            if ((stream == null) && (selectQuery == null)) {
                selectQuery = "";
            }

            String encoding = LiquibaseConfiguration.getInstance().getConfiguration(GlobalConfiguration.class).getOutputEncoding();
            if (selectQuery != null) {
                try {
                    stream = new ByteArrayInputStream(selectQuery.getBytes(encoding));
                } catch (UnsupportedEncodingException e) {
                    throw new AssertionError(encoding+" is not supported by the JVM, this should not happen according to the JavaDoc of the Charset class");
                }
            }

			CheckSum checkSum = CheckSum.compute(new AbstractSQLChange.NormalizingStream(";", false, false, stream), false);

            return CheckSum.compute(super.generateCheckSum().toString() + ":" + checkSum.toString());
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException ignore) {
                }
            }
        }

    }
Calculates the checksum based on the contained SQL.

@see liquibase.change.AbstractChange#generateCheckSum()