parser/sql/dialect/postgresql/src/main/java/org/apache/shardingsphere/sql/parser/postgresql/visitor/statement/PostgreSQLStatementVisitor.java [1162:1176]:
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    private String getJoinType(final JoinedTableContext ctx) {
        if (null != ctx.crossJoinType()) {
            return JoinType.CROSS.name();
        }
        if (null != ctx.innerJoinType()) {
            return JoinType.INNER.name();
        }
        if (null != ctx.outerJoinType()) {
            return getOutJoinType(ctx.outerJoinType());
        }
        if (null != ctx.naturalJoinType()) {
            return getNaturalJoinType(ctx.naturalJoinType());
        }
        return JoinType.COMMA.name();
    }
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parser/sql/dialect/opengauss/src/main/java/org/apache/shardingsphere/sql/parser/opengauss/visitor/statement/OpenGaussStatementVisitor.java [1210:1224]:
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    private String getJoinType(final JoinedTableContext ctx) {
        if (null != ctx.crossJoinType()) {
            return JoinType.CROSS.name();
        }
        if (null != ctx.innerJoinType()) {
            return JoinType.INNER.name();
        }
        if (null != ctx.outerJoinType()) {
            return getOutJoinType(ctx.outerJoinType());
        }
        if (null != ctx.naturalJoinType()) {
            return getNaturalJoinType(ctx.naturalJoinType());
        }
        return JoinType.COMMA.name();
    }
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