@uwdata/mosaic-sql/dist/src/ast/select.js

SQL query construction and analysis.

import { SELECT_CLAUSE } from '../constants.js';
import { quoteIdentifier } from '../util/string.js';
import { ColumnRefNode } from './column-ref.js';
import { SQLNode } from './node.js';
export class SelectClauseNode extends SQLNode {
    /** The select expression. */
    expr;
    /** The output name. */
    alias;
    /**
     * Instantiate a select node.
     * @param expr The select expression.
     * @param alias The output name.
     */
    constructor(expr, alias) {
        super(SELECT_CLAUSE);
        this.expr = expr;
        this.alias = alias;
    }
    /**
     * Generate a SQL query string for this node.
     */
    toString() {
        const { expr, alias } = this;
        return !alias || isColumnRefFor(expr, alias)
            ? `${expr}`
            : `${expr} AS ${quoteIdentifier(alias)}`;
    }
}
function isColumnRefFor(expr, name) {
    return expr instanceof ColumnRefNode
        && expr.table == null
        && expr.column === name;
}
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