exposed-jdbc/src/main/kotlin/org/jetbrains/exposed/v1/jdbc/SetOperations.kt [35:71]:
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        get() = TransactionManager.current()

    /** The SQL statement on the left-hand side of the set operator. */
    val firstStatement: AbstractQuery<*> = when (_firstStatement) {
        is Query -> {
            val newSlice = _firstStatement.set.fields.mapIndexed { index, expression ->
                when (expression) {
                    is Column<*>, is IExpressionAlias<*> -> expression
                    is ExpressionWithColumnType<*> -> expression.alias("exp$index")
                    else -> expression.alias("exp$index")
                }
            }
            _firstStatement.copy().adjustSelect { select(newSlice) }
        }
        is SetOperation -> _firstStatement
        else -> error("Unsupported statement type ${_firstStatement::class.simpleName} in $operationName")
    }

    private val rawStatements: List<AbstractQuery<*>> = listOf(firstStatement, secondStatement)

    init {
        require(rawStatements.isNotEmpty()) { "$operationName is empty" }
        require(rawStatements.none { it is Query && it.isForUpdate() }) { "FOR UPDATE is not allowed within $operationName" }
        require(rawStatements.map { it.set.realFields.size }.distinct().size == 1) {
            "Each $operationName query must have the same number of columns"
        }
        if (!currentDialect.supportsSubqueryUnions) {
            require(rawStatements.none { q -> q.orderByExpressions.isNotEmpty() || q.limit != null }) {
                "$operationName may not contain subqueries"
            }
        }
    }

    override val set: FieldSet = firstStatement.set

    /** The SQL keyword representing the set operation. */
    open val operationName = operationName
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exposed-r2dbc/src/main/kotlin/org/jetbrains/exposed/v1/r2dbc/SetOperations.kt [37:73]:
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        get() = TransactionManager.current()

    /** The SQL statement on the left-hand side of the set operator. */
    val firstStatement: AbstractQuery<*> = when (_firstStatement) {
        is Query -> {
            val newSlice = _firstStatement.set.fields.mapIndexed { index, expression ->
                when (expression) {
                    is Column<*>, is IExpressionAlias<*> -> expression
                    is ExpressionWithColumnType<*> -> expression.alias("exp$index")
                    else -> expression.alias("exp$index")
                }
            }
            _firstStatement.copy().adjustSelect { select(newSlice) }
        }
        is SetOperation -> _firstStatement
        else -> error("Unsupported statement type ${_firstStatement::class.simpleName} in $operationName")
    }

    private val rawStatements: List<AbstractQuery<*>> = listOf(firstStatement, secondStatement)

    init {
        require(rawStatements.isNotEmpty()) { "$operationName is empty" }
        require(rawStatements.none { it is Query && it.isForUpdate() }) { "FOR UPDATE is not allowed within $operationName" }
        require(rawStatements.map { it.set.realFields.size }.distinct().size == 1) {
            "Each $operationName query must have the same number of columns"
        }
        if (!currentDialect.supportsSubqueryUnions) {
            require(rawStatements.none { q -> q.orderByExpressions.isNotEmpty() || q.limit != null }) {
                "$operationName may not contain subqueries"
            }
        }
    }

    override val set: FieldSet = firstStatement.set

    /** The SQL keyword representing the set operation. */
    open val operationName = operationName
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