diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual.tex | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/doc/manual.tex b/doc/manual.tex index 1ff3f7aa..e140fac1 100644 --- a/doc/manual.tex +++ b/doc/manual.tex @@ -509,8 +509,8 @@ $$\begin{array}{rrcll} &&& \ell & \textrm{constant} \\ &&& \hat{X} & \textrm{nullary constructor} \\ &&& \hat{X} \; p & \textrm{unary constructor} \\ - &&& \{(x = p,)^*\} & \textrm{rigid record pattern} \\ - &&& \{(x = p,)^+, \ldots\} & \textrm{flexible record pattern} \\ + &&& \{(X = p,)^*\} & \textrm{rigid record pattern} \\ + &&& \{(X = p,)^+, \ldots\} & \textrm{flexible record pattern} \\ &&& p : \tau & \textrm{type annotation} \\ &&& (p) & \textrm{explicit precedence} \\ \\ @@ -968,11 +968,11 @@ $$\infer{\Gamma \vdash M.X \; p \leadsto \Gamma'; \overline{[x_i \mapsto \tau'_i & \Gamma \vdash p \leadsto \Gamma'; \overline{[x_i \mapsto \tau'_i]}\tau'' }$$ -$$\infer{\Gamma \vdash \{\overline{x = p}\} \leadsto \Gamma_n; \{\overline{x = \tau}\}}{ +$$\infer{\Gamma \vdash \{\overline{X = p}\} \leadsto \Gamma_n; \{\overline{X = \tau}\}}{ \Gamma_0 = \Gamma & \forall i: \Gamma_i \vdash p_i \leadsto \Gamma_{i+1}; \tau_i } -\quad \infer{\Gamma \vdash \{\overline{x = p}, \ldots\} \leadsto \Gamma_n; \$([\overline{x = \tau}] \rc c)}{ +\quad \infer{\Gamma \vdash \{\overline{X = p}, \ldots\} \leadsto \Gamma_n; \$([\overline{X = \tau}] \rc c)}{ \Gamma_0 = \Gamma & \forall i: \Gamma_i \vdash p_i \leadsto \Gamma_{i+1}; \tau_i }$$ @@ -1424,7 +1424,7 @@ $$\begin{array}{l} \hspace{.1in} \to (\mt{nm} :: \mt{Name} \to \mt{v} :: \mt{K} \to \mt{r} :: \{\mt{K}\} \to [[\mt{nm}] \sim \mt{r}] \Rightarrow \\ \hspace{.2in} \mt{tf} \; \mt{r} \to \mt{tf} \; ([\mt{nm} = \mt{v}] \rc \mt{r})) \\ \hspace{.1in} \to \mt{tf} \; [] \\ - \hspace{.1in} \to \mt{r} :: \{\mt{K}\} \to \mt{folder} \; \mt{r} \to \mt{tf} \; \mt{r} + \hspace{.1in} \to \mt{r} ::: \{\mt{K}\} \to \mt{folder} \; \mt{r} \to \mt{tf} \; \mt{r} \end{array}$$ For a type-level record $\mt{r}$, a $\mt{folder} \; \mt{r}$ encodes a permutation of $\mt{r}$'s elements. The $\mt{fold}$ function can be called on a $\mt{folder}$ to iterate over the elements of $\mt{r}$ in that order. $\mt{fold}$ is parameterized on a type-level function to be used to calculate the type of each intermediate result of folding. After processing a subset $\mt{r'}$ of $\mt{r}$'s entries, the type of the accumulator should be $\mt{tf} \; \mt{r'}$. The next two expression arguments to $\mt{fold}$ are the usual step function and initial accumulator, familiar from fold functions over lists. The final two arguments are the record to fold over and a $\mt{folder}$ for it. @@ -1861,7 +1861,7 @@ Any SQL query that returns single columns may be turned into a subquery expressi $$\begin{array}{l} \mt{val} \; \mt{sql\_subquery} : \mt{tables} ::: \{\{\mt{Type}\}\} \to \mt{agg} ::: \{\{\mt{Type}\}\} \to \mt{exps} ::: \{\mt{Type}\} \to \mt{nm} ::: \mt{Name} \to \mt{t} ::: \mt{Type} \to \mt{nt} ::: \mt{Type} \\ -\hspace{.1in} \to \mt{nullify} \; \mt{t} \; \mt{nt} \to \mt{sql\_query} \; \mt{tables} \; \mt{agg} \; [\mt{nm} = \mt{t}] \to \mt{sql\_exp} \; \mt{tables} \; \mt{agg} \; \mt{exps} \; \mt{nt} +\hspace{.1in} \to \mt{nullify} \; \mt{t} \; \mt{nt} \to \mt{sql\_query} \; \mt{tables} \; \mt{agg} \; [] \; [\mt{nm} = \mt{t}] \to \mt{sql\_exp} \; \mt{tables} \; \mt{agg} \; \mt{exps} \; \mt{nt} \end{array}$$ There is also an \cd{IF..THEN..ELSE..} construct that is compiled into standard SQL \cd{CASE} expressions. @@ -1990,7 +1990,7 @@ $$\begin{array}{l} \hspace{.1in} \to \$(\mt{map} \; (\mt{sql\_exp} \; [] \; [] \; []) \; \mt{fields}) \to \mt{dml} \end{array}$$ -An $\mt{UPDATE}$ command is formed from a choice of which table fields to leave alone and which to change, along with an expression to use to compute the new value of each changed field and a $\mt{WHERE}$ clause. Note that, in the table environment applied to expressions, the table being updated is hardcoded at the name $\mt{T}$. The parsing extension for $\mt{UPDATE}$ will elaborate all table-free field references to use table variable $\mt{T}$. +An $\mt{UPDATE}$ command is formed from a choice of which table fields to leave alone and which to change, along with an expression to use to compute the new value of each changed field and a $\mt{WHERE}$ clause. Note that, in the table environment applied to expressions, the table being updated is hardcoded at the name $\mt{T}$. The parsing extension for $\mt{UPDATE}$ will elaborate all table-free field references to use constant table name $\mt{T}$. $$\begin{array}{l} \mt{val} \; \mt{update} : \mt{unchanged} ::: \{\mt{Type}\} \to \mt{changed} :: \{\mt{Type}\} \to [\mt{changed} \sim \mt{unchanged}] \\ \hspace{.1in} \Rightarrow \$(\mt{map} \; (\mt{sql\_exp} \; [\mt{T} = \mt{changed} \rc \mt{unchanged}] \; [] \; []) \; \mt{changed}) \\ @@ -2287,11 +2287,12 @@ $$\begin{array}{rrcll} \textrm{Tables} & T &::=& x & \textrm{table variable, named locally by its own capitalization} \\ &&& x \; \mt{AS} \; X & \textrm{table variable, with local name} \\ &&& x \; \mt{AS} \; \{c\} & \textrm{table variable, with computed local name} \\ - &&& \{\{e\}\} \; \mt{AS} \; t & \textrm{computed table expression, with local name} \\ + &&& \{\{e\}\} \; \mt{AS} \; X & \textrm{computed table expression, with local name} \\ &&& \{\{e\}\} \; \mt{AS} \; \{c\} & \textrm{computed table expression, with computed local name} \\ \textrm{$\mt{FROM}$ items} & F &::=& T \mid \{\{e\}\} \mid F \; J \; \mt{JOIN} \; F \; \mt{ON} \; E \\ &&& \mid F \; \mt{CROSS} \; \mt{JOIN} \ F \\ - &&& \mid (Q) \; \mt{AS} \; t \mid (\{\{e\}\}) \; \mt{AS} \; t \\ + &&& \mid (Q) \; \mt{AS} \; X \mid (Q) \; \mt{AS} \; \{c\} \\ + &&& \mid (\{\{e\}\}) \; \mt{AS} \; t \\ \textrm{Joins} & J &::=& [\mt{INNER}] \\ &&& \mid [\mt{LEFT} \mid \mt{RIGHT} \mid \mt{FULL}] \; [\mt{OUTER}] \\ \textrm{SQL expressions} & E &::=& t.f & \textrm{column references} \\ |