parser/sql/dialect/postgresql/src/main/java/org/apache/shardingsphere/sql/parser/postgresql/visitor/statement/type/PostgreSQLDDLStatementVisitor.java [579:591]:
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    public ASTNode visitTableConstraint(final TableConstraintContext ctx) {
        ConstraintDefinitionSegment result = new ConstraintDefinitionSegment(ctx.getStart().getStartIndex(), ctx.getStop().getStopIndex());
        if (null != ctx.constraintClause()) {
            result.setConstraintName((ConstraintSegment) visit(ctx.constraintClause().constraintName()));
        }
        if (null != ctx.tableConstraintOption().primaryKey()) {
            result.getPrimaryKeyColumns().addAll(((CollectionValue<ColumnSegment>) visit(ctx.tableConstraintOption().columnNames(0))).getValue());
        }
        if (null != ctx.tableConstraintOption().FOREIGN()) {
            result.setReferencedTable((SimpleTableSegment) visit(ctx.tableConstraintOption().tableName()));
        }
        return result;
    }
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parser/sql/dialect/opengauss/src/main/java/org/apache/shardingsphere/sql/parser/opengauss/visitor/statement/type/OpenGaussDDLStatementVisitor.java [466:478]:
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    public ASTNode visitTableConstraint(final TableConstraintContext ctx) {
        ConstraintDefinitionSegment result = new ConstraintDefinitionSegment(ctx.getStart().getStartIndex(), ctx.getStop().getStopIndex());
        if (null != ctx.constraintClause()) {
            result.setConstraintName((ConstraintSegment) visit(ctx.constraintClause().constraintName()));
        }
        if (null != ctx.tableConstraintOption().primaryKey()) {
            result.getPrimaryKeyColumns().addAll(((CollectionValue<ColumnSegment>) visit(ctx.tableConstraintOption().columnNames(0))).getValue());
        }
        if (null != ctx.tableConstraintOption().FOREIGN()) {
            result.setReferencedTable((SimpleTableSegment) visit(ctx.tableConstraintOption().tableName()));
        }
        return result;
    }
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